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The Indus ( ) is a transboundary river of Asia and a trans- Himalayan river of South and
Central Asia Central Asia is a region of Asia consisting of Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan. The countries as a group are also colloquially referred to as the "-stans" as all have names ending with the Persian language, Pers ...
. The river rises in mountain springs northeast of
Mount Kailash Mount Kailash (also Kailasa; ''Kangrinboqê'' or ''Gang Rinpoche''; ; ; , ) is a mountain in Ngari Prefecture, Tibet Autonomous Region of China. It lies in the Kailash Range (Gangdisê Mountains) of the Transhimalaya, in the western part ...
in the Western Tibet region of
China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
, flows northwest through the disputed
Kashmir Kashmir ( or ) is the Northwestern Indian subcontinent, northernmost geographical region of the Indian subcontinent. Until the mid-19th century, the term ''Kashmir'' denoted only the Kashmir Valley between the Great Himalayas and the Pir P ...
region, first through the Indian-administered
Ladakh Ladakh () is a region administered by India as a union territory and constitutes an eastern portion of the larger Kashmir region that has been the subject of a Kashmir#Kashmir dispute, dispute between India and Pakistan since 1947 and India an ...
, and then the Pakistani administered Gilgit Baltistan, Quote: "Kashmir, region of the northwestern Indian subcontinent. It is bounded by the Uygur Autonomous Region of Xinjiang to the northeast and the Tibet Autonomous Region to the east (both parts of China), by the Indian states of Himachal Pradesh and Punjab to the south, by Pakistan to the west, and by Afghanistan to the northwest. The northern and western portions are administered by Pakistan and comprise three areas: Azad Kashmir, Gilgit, and Baltistan, ... The southern and southeastern portions constitute the Indian state of Jammu and Kashmir. The Indian- and Pakistani-administered portions are divided by a "line of control" agreed to in 1972, although neither country recognizes it as an international boundary. In addition, China became active in the eastern area of Kashmir in the 1950s and since 1962 has controlled the northeastern part of Ladakh (the easternmost portion of the region)." bends sharply to the left after the Nanga Parbat
massif A massif () is a principal mountain mass, such as a compact portion of a mountain range, containing one or more summits (e.g. France's Massif Central). In mountaineering literature, ''massif'' is frequently used to denote the main mass of an ...
, and flows south-by-southwest through
Pakistan Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the List of countries and dependencies by population, fifth-most populous country, with a population of over 241.5 million, having the Islam by country# ...
, before bifurcating and emptying into the
Arabian Sea The Arabian Sea () is a region of sea in the northern Indian Ocean, bounded on the west by the Arabian Peninsula, Gulf of Aden and Guardafui Channel, on the northwest by Gulf of Oman and Iran, on the north by Pakistan, on the east by India, and ...
, its main stem located near the port city of
Karachi Karachi is the capital city of the Administrative units of Pakistan, province of Sindh, Pakistan. It is the List of cities in Pakistan by population, largest city in Pakistan and 12th List of largest cities, largest in the world, with a popul ...
. The Indus river has a total drainage area of circa . Its estimated annual flow is around , making it one of the 50 largest rivers in the world in terms of average annual flow. Its left-bank
tributary A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which they ...
in Ladakh is the Zanskar River, and its left-bank tributary in the plains is the Panjnad River which is formed by the successive confluences of the five Punjab rivers, namely the Chenab, Jhelum, Ravi, Beas, and Sutlej rivers. Its principal right-bank tributaries are the Shyok, Gilgit,
Kabul Kabul is the capital and largest city of Afghanistan. Located in the eastern half of the country, it is also a municipality, forming part of the Kabul Province. The city is divided for administration into #Districts, 22 municipal districts. A ...
, Kurram, and Gomal rivers. Beginning in a mountain spring and fed with
glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...
s and rivers in the Himalayan, Karakoram, and Hindu Kush ranges, the river supports the
ecosystem An ecosystem (or ecological system) is a system formed by Organism, organisms in interaction with their Biophysical environment, environment. The Biotic material, biotic and abiotic components are linked together through nutrient cycles and en ...
s of
temperate forest A temperate forest is a forest found between the tropical and boreal regions, located in the temperate zone. It is the second largest terrestrial biome, covering 25% of the world's forest area, only behind the boreal forest, which covers about 3 ...
s, plains, and arid countryside. Geologically, the headwaters of the Indus and to their east those of the Yarlung Tsangpo (later in its course, the Brahmaputra) flow along the Indus-Yarlung suture zone, which defines the boundary along which the Indian plate collided with the Eurasian plate in the
Early Eocene In the geologic timescale the Ypresian is the oldest age (geology), age or lowest stage (stratigraphy), stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by th ...
(approximately 50 Million years ago). These two Eurasian rivers, whose courses were continually diverted by the rising Himalayas, define the western and eastern limits, respectively, of the mountain range. After the Indus debouches from its narrow Himalayan valley, it forms, along with its tributaries, the Punjab region of South Asia. The lower course of the river ends in a large delta in the
Sindh Sindh ( ; ; , ; abbr. SD, historically romanized as Sind (caliphal province), Sind or Scinde) is a Administrative units of Pakistan, province of Pakistan. Located in the Geography of Pakistan, southeastern region of the country, Sindh is t ...
province of Pakistan. Historically, the Indus was important to many cultures. The 3rd millennium BC saw the rise of
Indus Valley Civilisation The Indus Valley Civilisation (IVC), also known as the Indus Civilisation, was a Bronze Age civilisation in the Northwestern South Asia, northwestern regions of South Asia, lasting from 3300 Common Era, BCE to 1300 BCE, and in i ...
, a major urban civilizationof the Bronze Age. During the 2nd millennium BC, the Punjab region was mentioned in the
Rigveda The ''Rigveda'' or ''Rig Veda'' (, , from wikt:ऋच्, ऋच्, "praise" and wikt:वेद, वेद, "knowledge") is an ancient Indian Miscellany, collection of Vedic Sanskrit hymns (''sūktas''). It is one of the four sacred canoni ...
hymns as ''Sapta Sindhu'' and in the Avesta religious texts as ''Hapta Həndu'' (both terms meaning " seven rivers"). Early historical kingdoms that arose in the Indus Valley include Gandhāra and Sindhu-Sauvīra. The Indus River came into the knowledge of the Western world early in the classical period, when King Darius of
Persia Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
sent his Greek subject Scylax of Caryanda to explore the river, .


Etymology and names

Etymologically,
English language English is a West Germanic language that developed in early medieval England and has since become a English as a lingua franca, global lingua franca. The namesake of the language is the Angles (tribe), Angles, one of the Germanic peoples th ...
word "Indus" comes from
Late Latin Late Latin is the scholarly name for the form of Literary Latin of late antiquity.Roberts (1996), p. 537. English dictionary definitions of Late Latin date this period from the 3rd to 6th centuries CE, and continuing into the 7th century in ...
Indus (1598), specifically a use of classical Latin ''Indus'' (inhabitant of India, Indian) from
ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ...
Ἰνδός "inhabitant of India, Indian, the River Indus" from
Achaemenian The Achaemenid Empire or Achaemenian Empire, also known as the Persian Empire or First Persian Empire (; , , ), was an Iranian peoples, Iranian empire founded by Cyrus the Great of the Achaemenid dynasty in 550 BC. Based in modern-day Iran, i ...
Old Persian "hindu," denoting an eastern province of the
Achaemenid empire The Achaemenid Empire or Achaemenian Empire, also known as the Persian Empire or First Persian Empire (; , , ), was an Iranian peoples, Iranian empire founded by Cyrus the Great of the Achaemenid dynasty in 550 BC. Based in modern-day Iran, i ...
(
Persian language Persian ( ), also known by its endonym and exonym, endonym Farsi (, Fārsī ), is a Western Iranian languages, Western Iranian language belonging to the Iranian languages, Iranian branch of the Indo-Iranian languages, Indo-Iranian subdivision ...
''hind'' India), and
Avestan Avestan ( ) is the liturgical language of Zoroastrianism. It belongs to the Iranian languages, Iranian branch of the Indo-European languages, Indo-European language family and was First language, originally spoken during the Avestan period, Old ...
''hiṇdu'', ''həṇdu'' "river," (natural) frontier; with same Proto Indo-Iranian language-root as
Sanskrit Sanskrit (; stem form ; nominal singular , ,) is a classical language belonging to the Indo-Aryan languages, Indo-Aryan branch of the Indo-European languages. It arose in northwest South Asia after its predecessor languages had Trans-cultural ...
sindhu (river), specifically the River Indus; hence also the region of the Indus, the province Sindh (which also developed into Hellenistic Greek Σίνθος ("the River Indus"). This river's traditional name in
Sanskrit Sanskrit (; stem form ; nominal singular , ,) is a classical language belonging to the Indo-Aryan languages, Indo-Aryan branch of the Indo-European languages. It arose in northwest South Asia after its predecessor languages had Trans-cultural ...
and Tibetan is "sindhu". In Sanskrit, its range of meanings includes: stream, river; Indus; flood; sea or ocean; region or country in the vicinity of the Indus, Sindh, people of Sindh." The modern name in
Urdu Urdu (; , , ) is an Indo-Aryan languages, Indo-Aryan language spoken chiefly in South Asia. It is the Languages of Pakistan, national language and ''lingua franca'' of Pakistan. In India, it is an Eighth Schedule to the Constitution of Indi ...
is ''Sindh'' () or ''Daryā-i-Sindh'' (), contrasting to the Province of Sindh (). The Ladakhis and Tibetans call the river ''Senge Tsangpo'' (སེང་གེ་གཙང་པོ།), Baltis call it ''Gemtsuh'' and ''Tsuh-Fo'',
Pashtuns Pashtuns (, , ; ;), also known as Pakhtuns, or Pathans, are an Iranian peoples, Iranic ethnic group primarily residing in southern and eastern Afghanistan and northwestern Pakistan. They were historically also referred to as Afghan (ethnon ...
call it ''Nilab'', ''Sher Darya'' and ''Abbasin'', while Sindhis call it ''Sindhu'', ''Mehran'', ''Purali'' and ''Samundar''.


Description

The Indus River provides key water resources for Pakistan's economy – especially the ''breadbasket'' of Punjab province, which accounts for most of the nation's agricultural production, and Sindh. The word Punjab means "land of five rivers" and the five rivers are Jhelum, Chenab, Ravi, Beas and Sutlej, all of which finally flow into the Indus. The Indus also supports many heavy industries and provides the main supply of potable water in Pakistan. The total length of the river varies in different sources. The length used in this article is , taken from the ''Himalayan Climate and Water Atlas'' (2015). Historically, the 1909 '' The Imperial Gazetteer of India'' gave it as "just over 1,800 miles". A shorter figure of has been widely used in modern sources, as has the one of . The modern ''
Encyclopedia Britannica An encyclopedia is a reference work or compendium providing summaries of knowledge, either general or special, in a particular field or discipline. Encyclopedias are divided into article (publishing), articles or entries that are arranged Alp ...
'' was originally published in 1999 with the shorter measurement, but was updated in 2015 to use the longer measurement. Both lengths are commonly found in modern publications; in some cases, both measurements can be found within the same work. An extended figure of circa was announced by a Chinese research group in 2011, based on a comprehensive remeasurement from satellite imagery, and a ground expedition to identify an alternative source point, but detailed analysis has not yet been published. The ultimate source of the Indus is in
Tibet Tibet (; ''Böd''; ), or Greater Tibet, is a region in the western part of East Asia, covering much of the Tibetan Plateau and spanning about . It is the homeland of the Tibetan people. Also resident on the plateau are other ethnic groups s ...
, but there is some debate about the exact source. The traditional source of the river is the ''Sênggê Kanbab'' ( Sênggê Zangbo) or "Lion's Mouth", a perennial spring not far from the sacred
Mount Kailash Mount Kailash (also Kailasa; ''Kangrinboqê'' or ''Gang Rinpoche''; ; ; , ) is a mountain in Ngari Prefecture, Tibet Autonomous Region of China. It lies in the Kailash Range (Gangdisê Mountains) of the Transhimalaya, in the western part ...
, marked by a long low line of Tibetan
chortens In Buddhism, a stupa (, ) is a domed hemispherical structure containing several types of sacred relics, including images, statues, metals, and ''śarīra''—the remains of Bhikkhu, Buddhist monks or Bhikkhuni, nuns. It is used as a place of ...
. There are several other tributaries nearby, which may form a longer stream than Sênggê Kanbab, but unlike the Sênggê Kanbab, are all dependent on snowmelt. The Zanskar River, which flows into the Indus in Ladakh, has a greater volume of water than the Indus itself before that point. An alternative reckoning begins the river around 300 km further upstream, at the
confluence In geography, a confluence (also ''conflux'') occurs where two or more watercourses join to form a single channel (geography), channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main ...
of the ''Sênggê'' Zangbo and Gar Tsangpo rivers, which drain the Nganglong Kangri and Gangdise Shan (Gang Rinpoche, Mt. Kailash) mountain ranges. The 2011 remeasurement suggested the source was a small lake northeast of Mount Kailash, rather than either of the two points previously used. The Indus then flows northwest through
Ladakh Ladakh () is a region administered by India as a union territory and constitutes an eastern portion of the larger Kashmir region that has been the subject of a Kashmir#Kashmir dispute, dispute between India and Pakistan since 1947 and India an ...
(Indian-administered Kashmir) and Baltistan and Gilgit (Pakistan-administered Kashmir), just south of the Karakoram range. The Shyok, Shigar and Gilgit rivers carry glacial waters into the main river. It gradually bends to the south and descends into the Punjab plains at Kalabagh, Pakistan. The Indus passes gigantic gorges deep near the Nanga Parbat
massif A massif () is a principal mountain mass, such as a compact portion of a mountain range, containing one or more summits (e.g. France's Massif Central). In mountaineering literature, ''massif'' is frequently used to denote the main mass of an ...
. It flows swiftly across Hazara and is dammed at the Tarbela Reservoir. The Kabul River joins it near Attock. The remainder of its route to the sea is in the plains of the Punjab and Sindh, where the flow of the river becomes slow and highly braided. It is joined by the Panjnad at Mithankot. Beyond this confluence, the river, at one time, was named the ''Satnad River'' (''sat'' = "seven", ''nadī'' = "river"), as the river now carried the waters of the Kabul River, the Indus River and the five Punjab rivers. When the river passes Jamshoro, it ends in a large delta to the South of Thatta in the
Sindh Sindh ( ; ; , ; abbr. SD, historically romanized as Sind (caliphal province), Sind or Scinde) is a Administrative units of Pakistan, province of Pakistan. Located in the Geography of Pakistan, southeastern region of the country, Sindh is t ...
province of Pakistan. The Indus is one of the few rivers in the world to exhibit a tidal bore. The Indus system is largely fed by the snow and glaciers of the
Himalayas The Himalayas, or Himalaya ( ), is a mountain range in Asia, separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the Earth's highest peaks, including the highest, Mount Everest. More than list of h ...
, Karakoram and the Hindu Kush ranges. The flow of the river is also determined by the seasons – it diminishes greatly in the winter while flooding its banks in the
monsoon A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in Atmosphere of Earth, atmospheric circulation and precipitation associated with annu ...
months from July to September. There is also evidence of a steady shift in the course of the river since prehistoric times – it deviated westwards from flowing into the Rann of Kutch and adjoining Banni grasslands after the 1816 earthquake. , Indus water flows in to the Rann of Kutch during its floods breaching flood banks.


History

The major cities of the
Indus Valley Civilisation The Indus Valley Civilisation (IVC), also known as the Indus Civilisation, was a Bronze Age civilisation in the Northwestern South Asia, northwestern regions of South Asia, lasting from 3300 Common Era, BCE to 1300 BCE, and in i ...
, such as Harappa and Mohenjo-daro, date back to around 3300 BC, and represent some of the largest human habitations of the ancient world. The Indus Valley Civilisation extended from across northeast Afghanistan to Pakistan and northwest India, with an upward reach from east of the Jhelum River to Ropar on the upper Sutlej. The coastal settlements extended from Sutkagan Dor at the Pakistan-
Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
border to Kutch in modern
Gujarat Gujarat () is a States of India, state along the Western India, western coast of India. Its coastline of about is the longest in the country, most of which lies on the Kathiawar peninsula. Gujarat is the List of states and union territories ...
, India. There is an Indus site on the Amu Darya at Shortughai in northern Afghanistan, and the Indus site Alamgirpur at the Hindon River is located only from Delhi. As of now, over 1,052 cities and settlements have been found, mainly in the general region of the Ghaggar-Hakra River and its tributaries. Among the settlements were the major urban centres of Harappa and Mohenjo-daro, as well as Lothal, Dholavira, Ganeriwala, and Rakhigarhi. Only 40 Indus Valley sites have been discovered on the Indus and its tributaries. However, it is notable that majority of the Indus script seals and inscribed objects discovered were found at sites along the Indus river. Most scholars believe that settlements of Gandhara grave culture of the early Indo-Aryans flourished in Gandhara from 1700 BC to 600 BC, when Mohenjo-daro and Harappa had already been abandoned. The
Rigveda The ''Rigveda'' or ''Rig Veda'' (, , from wikt:ऋच्, ऋच्, "praise" and wikt:वेद, वेद, "knowledge") is an ancient Indian Miscellany, collection of Vedic Sanskrit hymns (''sūktas''). It is one of the four sacred canoni ...
describes several rivers, including one named "Sindhu". The Rigvedic "Sindhu" is thought to be the present-day Indus River. It is attested 176 times in its text, 94 times in the plural, and most often used in the generic sense of "river". In the Rigveda, notably in the later hymns, the meaning of the word is narrowed to refer to the Indus river in particular; for example, in the list of rivers mentioned in the hymn of '' Nadistuti sukta''. The Rigvedic hymns apply a feminine gender to all the rivers mentioned therein, except for the Brahmaputra. The word "India" is derived from the Indus River. In ancient times, "India" initially referred to those regions immediately along the east bank of the Indus, where are Punjab and
Sindh Sindh ( ; ; , ; abbr. SD, historically romanized as Sind (caliphal province), Sind or Scinde) is a Administrative units of Pakistan, province of Pakistan. Located in the Geography of Pakistan, southeastern region of the country, Sindh is t ...
now but by 300 BC, Greek writers including
Herodotus Herodotus (; BC) was a Greek historian and geographer from the Greek city of Halicarnassus (now Bodrum, Turkey), under Persian control in the 5th century BC, and a later citizen of Thurii in modern Calabria, Italy. He wrote the '' Histori ...
and Megasthenes were applying the term to the entire subcontinent that extends much farther eastward. The lower basin of the Indus forms a natural boundary between the Iranian Plateau and the
Indian subcontinent The Indian subcontinent is a physiographic region of Asia below the Himalayas which projects into the Indian Ocean between the Bay of Bengal to the east and the Arabian Sea to the west. It is now divided between Bangladesh, India, and Pakista ...
; this region embraces all or parts of the Pakistani provinces Balochistan,
Khyber Pakhtunkhwa Khyber Pakhtunkhwa (; ; , ; abbr. KP or KPK), formerly known as the North West Frontier Province (NWFP), is a Administrative units of Pakistan, province of Pakistan. Located in the Northern Pakistan, northwestern region of the country, Khyber ...
, Punjab and
Sindh Sindh ( ; ; , ; abbr. SD, historically romanized as Sind (caliphal province), Sind or Scinde) is a Administrative units of Pakistan, province of Pakistan. Located in the Geography of Pakistan, southeastern region of the country, Sindh is t ...
and the countries Afghanistan and India. The first West Eurasian empire to annex the Indus Valley was the
Persian Empire The Achaemenid Empire or Achaemenian Empire, also known as the Persian Empire or First Persian Empire (; , , ), was an Iranian empire founded by Cyrus the Great of the Achaemenid dynasty in 550 BC. Based in modern-day Iran, it was the larg ...
, during the reign of
Darius the Great Darius I ( ; – 486 BCE), commonly known as Darius the Great, was the third King of Kings of the Achaemenid Empire, reigning from 522 BCE until his death in 486 BCE. He ruled the empire at its territorial peak, when it included much of West A ...
. During his reign, the Greek explorer Scylax of Caryanda was commissioned to explore the course of the Indus. It was crossed by the invading armies of
Alexander Alexander () is a male name of Greek origin. The most prominent bearer of the name is Alexander the Great, the king of the Ancient Greek kingdom of Macedonia who created one of the largest empires in ancient history. Variants listed here ar ...
. Still, after his Macedonians conquered the west bank—joining it to the Hellenic world, they elected to retreat along the southern course of the river, ending Alexander's Asian campaign. Alexander's admiral
Nearchus Nearchus or Nearchos (; – 300 BC) was one of the Greeks, Greek officers, a navarch, in the army of Alexander the Great. He is known for his celebrated expeditionary voyage starting from the Indus River, through the Persian Gulf and ending at t ...
set out from the Indus Delta to explore the
Persian Gulf The Persian Gulf, sometimes called the Arabian Gulf, is a Mediterranean seas, mediterranean sea in West Asia. The body of water is an extension of the Arabian Sea and the larger Indian Ocean located between Iran and the Arabian Peninsula.Un ...
, until reaching the
Tigris The Tigris ( ; see #Etymology, below) is the eastern of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of the Armenian Highlands through the Syrian Desert, Syrian and Arabia ...
. The Indus Valley was later dominated by the Mauryan and
Kushan Empire The Kushan Empire (– CE) was a Syncretism, syncretic empire formed by the Yuezhi in the Bactrian territories in the early 1st century. It spread to encompass much of what is now Afghanistan, Eastern Iran, India, Pakistan, Tajikistan and Uzbe ...
s, Indo-Greek Kingdoms, Indo-Scythians and Hepthalites. Over several centuries
Muslim Muslims () are people who adhere to Islam, a Monotheism, monotheistic religion belonging to the Abrahamic religions, Abrahamic tradition. They consider the Quran, the foundational religious text of Islam, to be the verbatim word of the God ...
armies of Muhammad ibn al-Qasim, Mahmud of Ghazni, Muhammad of Ghor, Timur and Babur crossed the river to invade Sindh and Punjab, providing a gateway to the Indian subcontinent.


Geology

The Indus River is an antecedent river, meaning that it existed before the Himalayas and entrenched itself while they were rising. The Indus River feeds the Indus submarine fan, which is the second largest sediment body on Earth. It consists of around 5 million cubic kilometers of material eroded from the mountains. Studies of the sediment in the modern river indicate that the Karakoram Mountains in northern Pakistan and India are the single most important source of material, with the Himalayas providing the next largest contribution, mostly via the large rivers of the Punjab (Jhelum, Ravi, Chenab, Beas and Sutlej). Analysis of sediments from the Arabian Sea has demonstrated that before five million years ago the Indus was not connected to these Punjab rivers which instead flowed east into the Ganga and were captured after that time. Earlier work showed that sand and silt from western Tibet was reaching the Arabian Sea by 45 million years ago, implying the existence of an ancient Indus River by that time. The delta of this proto-Indus river has subsequently been found in the Katawaz Basin, on the Afghan-Pakistan border. In the Nanga Parbat region, the massive amounts of erosion due to the Indus river following the capture and rerouting through that area are thought to bring middle and lower crustal rocks to the surface. In November 2011, satellite images showed that the Indus river had re-entered India and was feeding the Great Rann of Kutch, Little Rann of Kutch and a lake near Ahmedabad known as Nal Sarovar. Heavy rains had left the river basin along with the Lake Manchar, Lake Hemal and Kalri Lake (all in modern-day Pakistan) inundated. This happened two centuries after the Indus river shifted its course westwards following the 1819 Rann of Kutch earthquake. The Induan Age at the start of the
Triassic The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is t ...
Period of geological time is named for the Indus region.


Tributaries

* Gar River * Gilgit River * Gomal River * Haro River * Hunza River * Kabul River * Kunar River * Kurram River * Panjnad River ** Chenab River *** Jhelum River *** Ravi River ** Satluj River *** Beas River * Shyok River * Soan River * Dras River (or Shingo River) * Swat River * Zanskar River * Luni river * Zhob River


Wildlife

Accounts of the Indus valley from the times of Alexander's campaign indicate a healthy forest cover in the region. The Mughal Emperor Babur writes of encountering rhinoceroses along its bank in his memoirs (the Baburnama). Extensive deforestation and human interference in the ecology of the Shivalik Hills has led to a marked deterioration in vegetation and growing conditions. The Indus valley regions are arid with poor vegetation. Agriculture is sustained largely due to
irrigation Irrigation (also referred to as watering of plants) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has bee ...
works. The Indus river and its watershed have a rich biodiversity. It is home to around 25 amphibian species.


Mammals

The Indus river dolphin (''Platanista indicus minor'') is found only in the Indus River. It is a subspecies of the South Asian river dolphin. The Indus river dolphin formerly also occurred in the tributaries of the Indus river. According to the World Wildlife Fund it is one of the most threatened cetaceans with only about 1,816 still existing. It is threatened by habitat degradation from the construction of dams and canals, entanglement in fishing gear, and industrial water pollution. There are two otter species in the Indus River basin: the Eurasian otter in the northeastern highland sections and the smooth-coated otter elsewhere in the river basin. The smooth-coated otters in the Indus River represent a subspecies found nowhere else, the Sindh otter (''Lutrogale perspicillata sindica'').


Fish

The Indus River basin has high diversity, being the home of more than 180 freshwater fish species, including 22 which are found nowhere else. Fish also played a major role in earlier cultures of the region, including the ancient Indus Valley Civilisation where depictions of fish were frequent. The Indus script has a commonly used fish sign, which in its various forms may simply have meant "fish", or referred to stars or gods. In the uppermost, highest part of the Indus River basin there are relatively few genera and species: '' Diptychus'', '' Ptychobarbus'', '' Schizopyge'', '' Schizopygopsis'' and '' Schizothorax'' snowtrout, '' Triplophysa'' loaches, and the catfish '' Glyptosternon reticulatum''. Going downstream these are soon joined by the golden mahseer '' Tor putitora'' (alternatively ''T. macrolepis'', although it often is regarded as a synonym of ''T. putitora'') and '' Schistura'' loaches. Downriver from around Thakot, Tarbela, the
Kabul Kabul is the capital and largest city of Afghanistan. Located in the eastern half of the country, it is also a municipality, forming part of the Kabul Province. The city is divided for administration into #Districts, 22 municipal districts. A ...
–Indus river confluence, Attock Khurd and
Peshawar Peshawar is the capital and List of cities in Khyber Pakhtunkhwa by population, largest city of the Administrative units of Pakistan, Pakistani province of Khyber Pakhtunkhwa. It is the sixth most populous city of Pakistan, with a district p ...
the diversity rises strongly, including many cyprinids ('' Amblypharyngodon'', '' Aspidoparia'', '' Barilius'', '' Chela'', '' Cirrhinus'', '' Crossocheilus'', '' Cyprinion'', ''
Danio ''Danio'' is a genus of small freshwater fish in the family (biology), family Cyprinidae found in South Asia, South and Southeast Asia, commonly kept in aquarium, aquaria. They are generally characterised by a pattern of horizontal stripes, rows ...
'', '' Devario'', '' Esomus'', '' Garra'', '' Labeo'', '' Naziritor'', '' Osteobrama'', '' Pethia'', '' Puntius'', '' Rasbora'', '' Salmophasia'', '' Securicula'' and '' Systomus''), true loaches ('' Botia'' and '' Lepidocephalus''), stone loaches ('' Acanthocobitis'' and '' Nemacheilus''), ailiid catfish ('' Clupisoma''), bagridae catfish ('' Batasio'', '' Mystus'', '' Rita'' and '' Sperata''), airsac catfish ('' Heteropneustes''), schilbid catfish ('' Eutropiichthys''), silurid catfish (''
Ompok ''Ompok'' is a genus of fish in the family (biology), family Siluridae found in lakes and large rivers throughout South Asia, South and Southeast Asia. Taxonomy The genus is recognized to be paraphyly, paraphyletic. The species of ''Ompok'' have ...
'' and '' Wallago''), sisorid catfish ('' Bagarius'', '' Gagata'', '' Glyptothorax'' and '' Sisor''), gouramis ('' Trichogaster''), nandid leaffish ('' Nandus''), snakeheads ('' Channa''), spiny eel ('' Macrognathus'' and '' Mastacembelus''), knifefish ('' Notopterus''), glassfish ('' Chanda'' and '' Parambassis''), clupeids ('' Gudusia''), needlefish ('' Xenentodon'') and gobies ('' Glossogobius''), as well as a few
introduced species An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived ther ...
. As the altitude further declines the Indus basin becomes overall quite slow-flowing as it passes through the Punjab Plain. Major
carp The term carp (: carp) is a generic common name for numerous species of freshwater fish from the family (biology), family Cyprinidae, a very large clade of ray-finned fish mostly native to Eurasia. While carp are prized game fish, quarries and a ...
become common, and chameleonfish ('' Badis''), mullet ('' Sicamugil'') and swamp eel ('' Monopterus'') appear. In some upland lakes and tributaries of the Punjab region snow trout and mahseer are still common, but once the Indus basin reaches its lower plain the former group is absent and the latter are rare. Many of the species of the middle sections of the Indus basin are also present in the lower. Notable examples of genera that are present in the lower plain but generally not elsewhere in the Indus River basin are the '' Aphanius'' pupfish, '' Aplocheilus'' killifish, palla fish (''Tenualosa ilisha''), catla (''Labeo catla''), rohu (''Labeo rohita'') and '' Cirrhinus mrigala''. The lowermost part of the river and its delta are home to freshwater fish, but also several brackish and marine species. This includes pomfret and prawns. The large delta has been recognized by conservationists as an important ecological region. Here, the river turns into many marshes, streams and creeks and meets the sea at shallow levels. Palla fish (''Tenualosa ilisha'') of the river is a delicacy for people living along the river. The population of fish in the river is moderately high, with
Sukkur Sukkur is a city in the Pakistani province of Sindh along the western bank of the Indus River, directly across from the historic city of Rohri. Sukkur is the List of cities in Sindh by population, third largest city in Sindh after Karachi and H ...
, Thatta, and Kotri being the major fishing centres – all in the lower Sindh course. As a result, damming and irrigation have made fish farming an important economic activity.


Economy

The Indus is the most important supplier of water resources to the Punjab and Sindh plains – it forms the backbone of agriculture and food production in Pakistan. The river is especially critical since rainfall is meagre in the lower Indus valley. Irrigation canals were first built by the people of the
Indus Valley civilisation The Indus Valley Civilisation (IVC), also known as the Indus Civilisation, was a Bronze Age civilisation in the Northwestern South Asia, northwestern regions of South Asia, lasting from 3300 Common Era, BCE to 1300 BCE, and in i ...
, and later by the engineers of the
Kushan Empire The Kushan Empire (– CE) was a Syncretism, syncretic empire formed by the Yuezhi in the Bactrian territories in the early 1st century. It spread to encompass much of what is now Afghanistan, Eastern Iran, India, Pakistan, Tajikistan and Uzbe ...
and the
Mughal Empire The Mughal Empire was an Early modern period, early modern empire in South Asia. At its peak, the empire stretched from the outer fringes of the Indus River Basin in the west, northern Afghanistan in the northwest, and Kashmir in the north, to ...
. Modern irrigation was introduced by the
British East India Company The East India Company (EIC) was an English, and later British, joint-stock company that was founded in 1600 and dissolved in 1874. It was formed to Indian Ocean trade, trade in the Indian Ocean region, initially with the East Indies (South A ...
in 1850 – the construction of modern canals accompanied with the restoration of old canals. The British supervised the construction of one of the most complex irrigation networks in the world. The Guddu Barrage is long – irrigating
Sukkur Sukkur is a city in the Pakistani province of Sindh along the western bank of the Indus River, directly across from the historic city of Rohri. Sukkur is the List of cities in Sindh by population, third largest city in Sindh after Karachi and H ...
, Jacobabad, Larkana and Kalat. The Sukkur Barrage serves over . After Pakistan came into existence, a water control treaty signed between India and Pakistan in 1960 guaranteed that Pakistan would receive water from the Indus River and its two tributaries the Jhelum River and the Chenab River independently of upstream control by India. The Indus Basin Project consisted primarily of the construction of two main dams, the Mangla Dam built on the Jhelum River and the Tarbela Dam constructed on the Indus River, together with their subsidiary dams. The Pakistan Water and Power Development Authority undertook the construction of the Chashma-Jhelum link canal – linking the waters of the Indus and Jhelum rivers – extending water supplies to the regions of Bahawalpur and Multan. Pakistan constructed the Tarbela Dam near
Rawalpindi Rawalpindi is the List of cities in Punjab, Pakistan by population, third-largest city in the Administrative units of Pakistan, Pakistani province of Punjab, Pakistan, Punjab. It is a commercial and industrial hub, being the list of cities in P ...
– standing long and high, with an long reservoir. It supports the Chashma Barrage near Dera Ismail Khan for irrigation use and flood control and the Taunsa Barrage near Dera Ghazi Khan which also produces 100,000 kilowatts of electricity. The Kotri Barrage near
Hyderabad Hyderabad is the capital and largest city of the Indian state of Telangana. It occupies on the Deccan Plateau along the banks of the Musi River (India), Musi River, in the northern part of Southern India. With an average altitude of , much ...
is long and provides additional water supplies for Karachi. The extensive linking of tributaries with the Indus has helped spread water resources to the valley of
Peshawar Peshawar is the capital and List of cities in Khyber Pakhtunkhwa by population, largest city of the Administrative units of Pakistan, Pakistani province of Khyber Pakhtunkhwa. It is the sixth most populous city of Pakistan, with a district p ...
, in the
Khyber Pakhtunkhwa Khyber Pakhtunkhwa (; ; , ; abbr. KP or KPK), formerly known as the North West Frontier Province (NWFP), is a Administrative units of Pakistan, province of Pakistan. Located in the Northern Pakistan, northwestern region of the country, Khyber ...
. The extensive irrigation and dam projects provide the basis for Pakistan's large production of crops such as cotton,
sugarcane Sugarcane or sugar cane is a species of tall, Perennial plant, perennial grass (in the genus ''Saccharum'', tribe Andropogoneae) that is used for sugar Sugar industry, production. The plants are 2–6 m (6–20 ft) tall with stout, jointed, fib ...
and wheat. The dams also generate electricity for heavy industries and urban centres.


People

The Indus River is sacred to Hindus. The Sindhu Darshan Festival is held on every Guru Purnima on the banks of the Indus. The ethnicities of the Indus Valley (Pakistan and Northwest India) have a greater amount of ANI (or West Eurasian) admixture than other South Asians, including inputs from Western Steppe Herders, with evidence of more sustained and multi-layered migrations from the west.


Modern issues


Indus delta

Originally, the delta used to receive almost all of the water from the Indus River, which has an annual flow of approximately , and is accompanied by of silt. Since the 1940s, dams, barrages and irrigation works have been constructed on the river. The Indus Basin Irrigation System is the "largest contiguous irrigation system developed over the past 140 years" anywhere in the world. This has reduced the flow of water and by 2018, the average annual flow of water below the Kotri barrage was , and annual amount of silt discharged was estimated at . As a result, the 2010 Pakistan floods were considered "good news" for the ecosystem and population of the river delta as they brought much-needed fresh water. Any further utilization of the river basin water is not economically feasible. Vegetation and wildlife of the Indus delta are threatened by the reduced inflow of fresh water, along with extensive deforestation, industrial pollution and
global warming Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes ...
. Damming has also isolated the delta population of Indus River dolphins from those further upstream. Large-scale diversion of the river's water for irrigation has raised far-reaching issues. Sediment clogging from poor maintenance of canals has affected agricultural production and vegetation on numerous occasions. Irrigation itself is increasing soil salinization, reducing crop yields and in some cases rendering farmland useless for cultivation.


Effects of climate change on the river

The Tibetan Plateau contains the world's third-largest store of ice. Qin Dahe, the former head of the China Meteorological Administration, said the recent fast pace of melting and warmer temperatures will be good for agriculture and tourism in the short term, but issued a strong warning:
Temperatures are rising four times faster than elsewhere in China, and the Tibetan glaciers are retreating at a higher speed than in any other part of the world... In the short term, this will cause lakes to expand and bring floods and mudflows... In the long run, the glaciers are vital lifelines of the Indus River. Once they vanish, water supplies in Pakistan will be in peril.
"There is insufficient data to say what will happen to the Indus," says David Grey, the World Bank's senior water advisor in South Asia. "But we all have very nasty fears that the flows of the Indus could be severely, severely affected by glacier melt as a consequence of
climate change Present-day climate change includes both global warming—the ongoing increase in Global surface temperature, global average temperature—and its wider effects on Earth's climate system. Climate variability and change, Climate change in ...
," and reduced by perhaps as much as 50 per cent. "Now what does that mean to a population that lives in a desert here without the river, there would be no life? I don't know the answer to that question," he says. "But we need to be concerned about that. Deeply, deeply concerned." U.S. diplomat Richard Holbrooke said, shortly before he died in 2010, that he believed that falling water levels in the Indus River "could very well precipitate World War III."


Pollution

Over the years factories on the banks of the Indus River have increased levels of water pollution in the river and the atmosphere around it. High levels of pollutants in the river have led to the deaths of endangered Indus river dolphin. The Sindh Environmental Protection Agency has ordered polluting factories around the river to shut down under the Pakistan Environmental Protection Act, 1997. Death of the Indus river dolphin has also been attributed to fishermen using poison to kill fish and scooping them up. As a result, the government banned fishing from Guddu Barrage to
Sukkur Sukkur is a city in the Pakistani province of Sindh along the western bank of the Indus River, directly across from the historic city of Rohri. Sukkur is the List of cities in Sindh by population, third largest city in Sindh after Karachi and H ...
. The Indus is second among a group of ten rivers responsible for about 90% of all the
plastic Plastics are a wide range of synthetic polymers, synthetic or Semisynthesis, semisynthetic materials composed primarily of Polymer, polymers. Their defining characteristic, Plasticity (physics), plasticity, allows them to be Injection moulding ...
that reaches the oceans. The Yangtze is the only river contributing more plastic.


2010 floods

Frequently, Indus River is prone to moderate to severe flooding. In July 2010, following abnormally heavy
monsoon A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in Atmosphere of Earth, atmospheric circulation and precipitation associated with annu ...
rains, the Indus River rose above its banks and started flooding. The rain continued for the next two months, devastating large areas of Pakistan. In
Sindh Sindh ( ; ; , ; abbr. SD, historically romanized as Sind (caliphal province), Sind or Scinde) is a Administrative units of Pakistan, province of Pakistan. Located in the Geography of Pakistan, southeastern region of the country, Sindh is t ...
, the Indus burst its banks near
Sukkur Sukkur is a city in the Pakistani province of Sindh along the western bank of the Indus River, directly across from the historic city of Rohri. Sukkur is the List of cities in Sindh by population, third largest city in Sindh after Karachi and H ...
on 8 August, submerging the village of Mor Khan Jatoi. In early August, the heaviest flooding moved southward along the Indus River from severely affected northern regions toward western Punjab, where at least of cropland was destroyed, and the southern province of Sindh. , over two thousand people had died and over a million homes had been destroyed since the flooding began.


2011 floods

The 2011
Sindh Sindh ( ; ; , ; abbr. SD, historically romanized as Sind (caliphal province), Sind or Scinde) is a Administrative units of Pakistan, province of Pakistan. Located in the Geography of Pakistan, southeastern region of the country, Sindh is t ...
floods began during the Pakistani monsoon season in mid-August 2011, resulting from heavy monsoon rains in Sindh, eastern Balochistan, and southern Punjab. The floods caused considerable damage; an estimated 434 civilians were killed, with 5.3 million people and 1,524,773 homes affected. Sindh is a fertile region and often called the "breadbasket" of the country; the damage and toll of the floods on the local agrarian economy was said to be extensive. At least of arable land were inundated. The flooding followed the previous year's floods, which devastated a large part of the country. Unprecedented torrential monsoon rains caused severe flooding in 16 districts of Sindh.


Barrages, bridges, levees and dams

In Pakistan currently there are six barrages on the Indus: Guddu Barrage, Sukkur Barrage, Kotri Barrage (also called Ghulam Muhammad barrage), Taunsa Barrage, Chashma Barrage and Jinnah Barrage. Another new barrage called " Sindh Barrage" is planned as a terminal barrage on the Indus River. There are some bridges on River Indus, such as Dadu Moro Bridge, Larkana Khairpur Indus River Bridge, Thatta-Sujawal bridge, Jhirk-Mula Katiar bridge and recently planned Kandhkot-Ghotki bridge. The entire left bank of Indus river in Sind province is protected from river flooding by constructing around 600 km long levees. The right bank side is also leveed from Guddu barrage to Lake Manchar. In response to the levees construction, the river has been aggrading rapidly over the last 20 years leading to breaches upstream of barrages and inundation of large areas. Tarbela Dam in Pakistan is constructed on the Indus River, while the controversial Kalabagh dam is also being constructed on Indus river. Pakistan is also building Munda Dam.


Gallery

File:River Indus at Kotri Barrage Jamshoro.webm, Video of River Indus at Kotri Barrage, Sindh, Pakistan. File:Lansdowne, Sukkur.jpg, Lansdowne Bridge and Ayub Bridge connecting the cities of Rohri and Sukkur in Sindh, Pakistan. File:Frozen Indus, Near Nyoma.jpg, Frozen Indus, Near Nyoma File:Indus at Skardu (1).jpg, Indus at Skardu File:Indus River Dera Ismail Khan.jpg, Indus near Dera Ismail Khan File:Indus Valley near Leh.jpg, The Indus near Leh


Tourism

Many Buddhist monasteries in
Ladakh Ladakh () is a region administered by India as a union territory and constitutes an eastern portion of the larger Kashmir region that has been the subject of a Kashmir#Kashmir dispute, dispute between India and Pakistan since 1947 and India an ...
, Indus-Sarasvati Valley Civilisation sites along the banks of Indus and
Sarasvati River The Sarasvati River () is a Apotheosis, deified myth, mythological Rigvedic rivers, river first mentioned in the Rigveda and later in Vedas, Vedic and post-Vedic texts. It played an important role in the Historical Vedic religion, Vedic religio ...
( Ghaggar-Hakra River) and in Indus Sagar Doab, Indus River Delta, various dams such as Baglihar Dam, Sindhu Darshan Festival held every year at Leh, Sindhu Pushkaram festival held every 12 years at confluence of Indus and Zanskar River at Nimoo once every 12 years for 12 days starting from when Jupiter enter into Kumbha rasi (Aquarius),Sindhu Pushkaram festival
, accessed 27 July 2023.
etc. are tourism opportunities.


See also

* Geology of the Himalayas * HMS ''Indus'' * Indus Waters Treaty * List of most-polluted rivers * List of rivers of Pakistan * Rigvedic rivers * Rivers of Jammu and Kashmir * Sindhology * Hindush


Explanatory notes


Citations


General and cited references

* Albinia, Alice. (2008) ''Empires of the Indus: The Story of a River''. First American Edition (20101) W. W. Norton & Company, New York. . * Alexander Burnes, ''A voyage on the Indus'', London, 1973 * Philippe Fabry, ''Wandering with the Indus'', with Yusuf Shahid (text) Lahore, 1995 * Jean Fairley, ''The Lion River: The Indus'', London, 1975 * * * D. Murphy, '' Where the Indus is Young'', London, 1977 * * Samina Quraeshi, ''Legacy of the Indus'', New York, 1974 * Schomberg, ''Between Oxus and Indus'', London, 1935 * Francine Tissot, ''Les Arts anciens du Pakistan et de l'Afghanistan'', Paris, 1987 * Sir M. Wheeler, ''Civilisations of the Indus Valley and Beyond'', London, 1966 * World Atlas, Millennium Edition, p. 265.


External links

* The origins of Indus: ** **
Northern Areas Development Gateway
* – covered parts of the Indus River
Indus River watershed map (World Resources Institute)
* * {{Authority control History of Sindh Indus Valley Civilisation International rivers of Asia Rigvedic rivers Rivers of China Rivers of Gilgit-Baltistan Rivers of Ladakh Rivers of Pakistan Rivers of Sindh Rivers of Tibet Sacred rivers Rivers in Buddhism Rivers of Khyber Pakhtunkhwa Rivers of Punjab, Pakistan Induan Water pollution in Pakistan