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Lower Mesopotamia is a
historical region Historical regions (or historical areas) are geographical regions which at some point in time had a cultural, ethnic, linguistic or political basis, regardless of latterday borders. They are used as delimitations for studying and analysing soc ...
of
Mesopotamia Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the ...
. It's located in the
alluvial plain An alluvial plain is a largely flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions, from which alluvial soil forms. A floodplain is part of the process, being the smal ...
of
Iraq Iraq,; ku, عێراق, translit=Êraq officially the Republic of Iraq, '; ku, کۆماری عێراق, translit=Komarî Êraq is a country in Western Asia. It is bordered by Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq ...
from the Hamrin Mountains to the Faw Peninsula near the
Persian Gulf The Persian Gulf ( fa, خلیج فارس, translit=xalij-e fârs, lit=Gulf of Fars, ), sometimes called the ( ar, اَلْخَلِيْجُ ٱلْعَرَبِيُّ, Al-Khalīj al-ˁArabī), is a mediterranean sea in Western Asia. The bo ...
. In the Middle Ages it was also known as the ''
Sawad Sawad was the name used in early Islamic times (7th–12th centuries) for southern Iraq. It means "black land" or "arable land" and refers to the stark contrast between the alluvial plain of Mesopotamia and the Arabian Desert. Under the Umayya ...
'' and
al-Jazira Jazira or Al-Jazira ( 'island'), or variants, may refer to: Business * Jazeera Airways, an airlines company based in Kuwait Locations * Al-Jazira, a traditional region known today as Upper Mesopotamia or the smaller region of Cizre * Al-Jazira ...
al-sflia ("Lower Jazira"), which strictly speaking designated only the southern alluvial plain, and ''al-ʻIrāq al-ʻArabi'' ("Arabian Irāq"), as opposed to " Persian Iraq", the
Jibal Jibāl ( ar, جبال), also al-Jabal ( ar, الجبل), was the name given by the Arabs to a region and province located in western Iran, under the Umayyad and Abbasid Caliphates. Its name means "the Mountains", being the plural of ''jabal'' (" ...
. Lower Mesopotamia was home to
Sumer Sumer () is the earliest known civilization in the historical region of southern Mesopotamia (south-central Iraq), emerging during the Chalcolithic and early Bronze Ages between the sixth and fifth millennium BC. It is one of the cradles of ...
and
Babylonia Babylonia (; Akkadian: , ''māt Akkadī'') was an ancient Akkadian-speaking state and cultural area based in the city of Babylon in central-southern Mesopotamia (present-day Iraq and parts of Syria). It emerged as an Amorite-ruled state c ...
. Regions of Iraq


Delimitation

The medieval Arab geographers placed the northern border between Iraq and
Upper Mesopotamia Upper Mesopotamia is the name used for the uplands and great outwash plain of northwestern Iraq, northeastern Syria and southeastern Turkey, in the northern Middle East. Since the early Muslim conquests of the mid-7th century, the region has been ...
(the ''Jazirah'') in a line running from Anbar on the Euphrates to
Tikrit Tikrit ( ar, تِكْرِيت ''Tikrīt'' , Syriac: ܬܲܓܪܝܼܬܼ ''Tagrīṯ'') is a city in Iraq, located northwest of Baghdad and southeast of Mosul on the Tigris River. It is the administrative center of the Saladin Governorate. , it h ...
on the
Tigris The Tigris () is the easternmost 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 and Arabian Deserts, and empties into the ...
, although later it was shifted to a line running due west from Tikrit, thus including several towns on the Euphrates past Anbar into Iraq.


Geography

An
alluvial plain An alluvial plain is a largely flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions, from which alluvial soil forms. A floodplain is part of the process, being the smal ...
begins north of
Tikrit Tikrit ( ar, تِكْرِيت ''Tikrīt'' , Syriac: ܬܲܓܪܝܼܬܼ ''Tagrīṯ'') is a city in Iraq, located northwest of Baghdad and southeast of Mosul on the Tigris River. It is the administrative center of the Saladin Governorate. , it h ...
Near Hamrin Mountains and extends to the
Persian Gulf The Persian Gulf ( fa, خلیج فارس, translit=xalij-e fârs, lit=Gulf of Fars, ), sometimes called the ( ar, اَلْخَلِيْجُ ٱلْعَرَبِيُّ, Al-Khalīj al-ˁArabī), is a mediterranean sea in Western Asia. The bo ...
. Here the
Tigris The Tigris () is the easternmost 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 and Arabian Deserts, and empties into the ...
and
Euphrates The Euphrates () is the longest and one of the most historically important rivers of Western Asia. Tigris–Euphrates river system, Together with the Tigris, it is one of the two defining rivers of Mesopotamia ( ''the land between the rivers'') ...
lie above the level of the plain in many places, and the whole area is a
river delta A river delta is a landform shaped like a triangle, created by deposition of sediment that is carried by a river and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rare ...
interlaced by the channels of the two rivers and by qanat. Intermittent
lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...
s, fed by the rivers in flood, also characterize southeastern Iraq. A fairly large area () just above the confluence of the two rivers at
al Qurnah Al-Qurnah (Kurnah or Qurna, meaning connection/joint in Arabic) is a town in southern Iraq about 74 km northwest of Basra, that lies within the conglomeration of Nahairat. Qurna is located at the confluence point of the Tigris and Euphrates river ...
and extending east of the Tigris beyond the Iranian border is marshland, known as Lake Hammar, the result of centuries of flooding and inadequate drainage. Much of it is permanent marsh, but some parts dry out in early winter, and other parts become marshland only in years of great flood. Because the waters of the Tigris and Euphrates above their confluence are heavily
silt Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz. Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension with water. Silt usually has a floury feel ...
-laden,
irrigation Irrigation (also referred to as watering) 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 been devel ...
and fairly frequent flooding deposit large quantities of silty loam in much of the delta area. Windborne silt contributes to the total deposit of sediments. It has been estimated that the delta plains are built up at the rate of nearly twenty centimeters in a century. In some areas, major floods lead to the deposit in temporary lakes of as much as thirty centimeters of mud. The Tigris and Euphrates also carry large quantities of
salt Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite. Salt is present in vast quant ...
s. These, too, are spread on the land by sometimes excessive irrigation and flooding. A high
water table The water table is the upper surface of the zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with water. It can also be simply explained as the depth below which the ground is saturated. T ...
and poor surface and subsurface drainage tend to concentrate the salts near the surface of the soil. In general, the salinity of the soil increases from Baghdad south to the Persian Gulf and severely limits productivity in the region south of Amarah. The
salinity Salinity () is the saltiness or amount of salt (chemistry), salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensio ...
is reflected in the large lake in central Iraq, southwest of Baghdad, known as Lake Milh. There are two other major lakes in the country to the north of Lake Milh: Lake Tharthar and Lake Habbaniyah.


See also

* List of Umayyad governors of Iraq


References


Sources

* {{Lands of the Eastern Caliphate Historical regions Geography of the Middle East History of the Middle East Near East Geography of Iraq