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East Kalimantan (
Indonesian Indonesian is anything of, from, or related to Indonesia, an archipelagic country in Southeast Asia. It may refer to: * Indonesians, citizens of Indonesia ** Native Indonesians, diverse groups of local inhabitants of the archipelago ** Indonesian ...
: ) is a
province A province is an administrative division within a country or sovereign state, state. The term derives from the ancient Roman , which was the major territorial and administrative unit of the Roman Empire, Roman Empire's territorial possessions ou ...
of
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...
. Its territory comprises the eastern portion of
Borneo Borneo () is the List of islands by area, third-largest island in the world, with an area of , and population of 23,053,723 (2020 national censuses). Situated at the geographic centre of Maritime Southeast Asia, it is one of the Greater Sunda ...
/
Kalimantan Kalimantan (; ) is the Indonesian portion of the island of Borneo. It constitutes 73% of the island's area, and consists of the provinces of Central Kalimantan, East Kalimantan, North Kalimantan, South Kalimantan, and West Kalimantan. The non-Ind ...
. It had a population of about 3.03 million at the 2010 census (within the current boundary),Biro Pusat Statistik, Jakarta, 2011. 3.42 million at the 2015 census, and 3.766 million at the 2020 census;Badan Pusat Statistik, Jakarta, 2021. the official estimate as at mid 2023 was 4,030,488.Badan Pusat Statistik, Jakarta, 28 February 2024, ''Provinsi Kalimantan Timur Dalam Angka 2024'' (Katalog-BPS 1102001.64) Its capital is the city of
Samarinda Samarinda is the capital city of the Provinces of Indonesia, Indonesian province of East Kalimantan on the island of Borneo. The city lies on the banks of the Mahakam River with a land area of . Samarinda was one of Indonesia's top ten City qu ...
, the most populous city in the entire Borneo. East Kalimantan has a total area of and is the third least densely populated province in
Kalimantan Kalimantan (; ) is the Indonesian portion of the island of Borneo. It constitutes 73% of the island's area, and consists of the provinces of Central Kalimantan, East Kalimantan, North Kalimantan, South Kalimantan, and West Kalimantan. The non-Ind ...
(after
North Kalimantan North Kalimantan () is a Provinces of Indonesia, province of Indonesia. It is located on the northernmost of Kalimantan, the Indonesian part of the island of Borneo. North Kalimantan borders the Malaysian states of Sabah to the north and Sarawa ...
and
Central Kalimantan Central Kalimantan () is a provinces of Indonesia, province of Indonesia. It is one of five provinces in Kalimantan, the Indonesian part of Borneo. It is the largest province in Indonesia by area since 2022, bordered by West Kalimantan to the west ...
). The majority of the region shares a maritime border to the east with
West Sulawesi West Sulawesi (), covering a land area of 17,152.99 km2 with its capital at Mamuju, is a province of Indonesia on the western side of Sulawesi (formerly Celebes) island, consisting 6 regencies ('' kabupaten''), namely Polewali Mandar, Ma ...
and
Central Sulawesi Central Sulawesi (Indonesian language, Indonesian: ''Sulawesi Tengah'') is a Provinces of Indonesia, province of Indonesia located at the centre of the island of Sulawesi. The administrative capital and largest city is located in Palu. The provin ...
; its
Cape Mangkalihat Cape Mangkalihat, also known as Cape Sangkulirang, is a cape in eastern Borneo. It is located in the Indonesian province of East Kalimantan, in the regencies of Berau (in the north) and East Kutai (in the south). The cape, as part of the Sangku ...
separates the
Makassar Strait Makassar Strait () is a strait between the islands of Borneo and Sulawesi in Indonesia. To the north it joins the Celebes Sea, while to the south it meets the Java Sea. To the northeast, it forms the Sangkulirang Bay south of the Mangkalihat P ...
from the
Celebes Sea The Celebes Sea ( ; ) or Sulawesi Sea (; ) of the western Pacific Ocean is bordered on the north by the Sulu Archipelago and Sulu Sea and Mindanao Island of the Philippines, on the east by the Sangihe Islands chain, on the south by Sulawes ...
. Its former northernmost region was split off on 25 October 2012 and is now
North Kalimantan North Kalimantan () is a Provinces of Indonesia, province of Indonesia. It is located on the northernmost of Kalimantan, the Indonesian part of the island of Borneo. North Kalimantan borders the Malaysian states of Sabah to the north and Sarawa ...
; meanwhile it still shares land border to the west with
West Kalimantan West Kalimantan () is a province of Indonesia. It is one of five Indonesian provinces comprising Kalimantan, the Indonesian part of the island of Borneo. Its capital and largest city is Pontianak. It is bordered by East Kalimantan and Central ...
and
Central Kalimantan Central Kalimantan () is a provinces of Indonesia, province of Indonesia. It is one of five provinces in Kalimantan, the Indonesian part of Borneo. It is the largest province in Indonesia by area since 2022, bordered by West Kalimantan to the west ...
; to its south, East Kalimantan borders
South Kalimantan South Kalimantan () is a Provinces of Indonesia, province of Indonesia. It is the second most populous province on the island of Kalimantan, the Indonesian territory of the island of Borneo after West Kalimantan. The provincial capital was Banjar ...
. The province bordered
Sabah Sabah () is a States and federal territories of Malaysia, state of Malaysia located in northern Borneo, in the region of East Malaysia. Sabah has land borders with the Malaysian state of Sarawak to the southwest and Indonesia's North Kalima ...
before the split, but still have a short border with
Sarawak Sarawak ( , ) is a States and federal territories of Malaysia, state of Malaysia. It is the largest among the 13 states, with an area almost equal to that of Peninsular Malaysia. Sarawak is located in East Malaysia in northwest Borneo, and is ...
, Malaysia through
Mahakam Ulu Regency Mahakam Ulu Regency (, lit. 'Upper Mahakam') is a regency (''kabupaten'') in the province of East Kalimantan, Indonesia. As the name implies, it comprises the upper valley of the Mahakam River. It covers an area of 18,427.81 km2. The regenc ...
. Since 2013, East Kalimantan is now divided into seven regencies and three cities. The proposed capital city of Indonesia, Nusantara, is currently constructed entirely within the province.


History


Prehistory

East Kalimantan was once mostly covered by tropical rainforest. In prehistoric times, there was limestone cave called ''
Lubang Jeriji Saléh Lubang Jeriji Saléh is a limestone cave complex in Indonesia, located within the Sangkulirang-Mangkalihat Karst in the remote jungle of the Bengalon district of East Kutai Regency, East Kalimantan province, on Borneo island. In 2018, a team ...
'' located in the Sangkulirang-Mangkalihat Karst in the district of Bengalon, East Kutai, believed to contain one of the oldest
figurative art Figurative art, sometimes written as figurativism, describes artwork (particularly paintings and sculptures) that is clearly derived from real object sources and so is, by definition, representational. The term is often in contrast to abstract a ...
in the world. The cave paintings were first spotted in 1994 by the French explorer Luc-Henri Fage and the French archaeologist Jean-Michel Chazine, from Kalimanthrope. In 2018, a team of scientists investigating the cave, led by Maxime Aubert from
Griffith University Griffith University is a public university, public research university in South East Queensland on the Eastern states of Australia, east coast of Australia. The university was founded in 1971, but was not officially opened until 1975. Griffith ...
and Pindi Setiawan from the
Bandung Institute of Technology The Bandung Institute of Technology (; , abbreviated as ITB) is a public research university located in Bandung, Indonesia. It has produced many notable leaders in science, engineering, politics, business, academia, and culture. ITB is one of th ...
, published a report in the journal ''
Nature Nature is an inherent character or constitution, particularly of the Ecosphere (planetary), ecosphere or the universe as a whole. In this general sense nature refers to the Scientific law, laws, elements and phenomenon, phenomena of the physic ...
'' identifying the paintings as the world's oldest known figurative art. The team had previously investigated cave paintings in the neighbouring island of
Sulawesi Sulawesi ( ), also known as Celebes ( ), is an island in Indonesia. One of the four Greater Sunda Islands, and the List of islands by area, world's 11th-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Min ...
. In order to date the paintings, the team used dating techniques on the calcium carbonate (limestone) deposits close to them.


4th to 17th centuries

East Kalimantan has been home to several kingdoms, such as the first and oldest Hindu kingdom of Indonesia, the Kingdom of Kutai Martadipura founded in the 4th century CE. It was succeeded by the Sultanate of Kutai ing Martadipura in the 14th century. Other kingdoms were also located in East Kalimantan, such as the Sultanate of Pasir. East Kalimantan region includes Pasir, Kutai, Berau and also Karasikan (Buranun / pre-Sultanate of Sulu) claimed as conquered territory Suryanata Maharaja, the governor of Majapahit in the State Dipa, located in the Great Temple in Amuntai, until 1620 in the
Sultanate of Banjar The Sultanate of Banjar () was a nation-state of the Banjar in the form of a Islamic sultanate in Borneo which was founded in 1526 and existed until its dissolution in 1860 by the colonial government of the Dutch East Indies and its collapse ...
. However, in the Chinese History Annals, Ming shi 明史, at 1417, some parts of the eastern Kalimantan were recorded as a kingdom under the rule of the Philippine kingdom of then Hindu
Sulu Sulu (), officially the Province of Sulu (Tausug language, Tausūg: ''Wilaya' sin Lupa' Sūg''; ), is a Provinces of the Philippines, province of the Philippines in the Sulu Archipelago. It was part of the Bangsamoro, Bangsamoro Autonomous R ...
, as Kalimantan was ruled by a Sulu monarch named Mahalatu Gelamading (Maharaja Klainbantangan) whose title, Klainbantangan, in Chinese rendering, was named after his territory
Kalimantan Kalimantan (; ) is the Indonesian portion of the island of Borneo. It constitutes 73% of the island's area, and consists of the provinces of Central Kalimantan, East Kalimantan, North Kalimantan, South Kalimantan, and West Kalimantan. The non-Ind ...
. At this point in time, Sulu had rebelled against Majapahit rule and had invaded Northeast and East Borneo all the way to the territory of Kalimantan. Between the years 1620–1624, kingdoms in East Kalimantan fell under the influence of the Sultanate of Sultan Alauddin Makassar, before the Bungaya agreement. According to the Hikayat Banjar, the Sultan of Makassar never borrowed land for trade covers an area east and southeast of Borneo to the Sultan Mustain Billah of Banjar when Kiai Martasura sent to Makassar and entered into an agreement with the Sultan Tallo I Mangngadaccinna Daeng I Ba'le 'Sultan Mahmud Karaeng Pattingalloang, who became Mangkubumi and principal advisor to the Sultan Muhammad Said, king of Gowa in 1638–1654 and also in-law of Sultan Hasanuddin, who established the East Kalimantan region as a place to trade for the Sultanate of Makassar (Gowa-Tallo); since then pepole began to arrive from South Sulawesi. However, based on the agreement between the Sultanate of Banjar and the Dutch East India Company (VOC) in 1635, VOC helped Banjar restore lands in East Kalimantan to the sphere of influence of the Sultanate of Banjar. It was set out in the Bungaya agreement that the Sultanate of Makassar was not allowed to trade up to the east and the north Borneo.


18th to 20th centuries

In accordance with treaties, on January 1, 1817, Sultan Sulaiman of Banjar handed East Kalimantan, Central Kalimantan, part of West and South Kalimantan (including Banjarmasin) over to the Dutch East Indies. On May 4, 1826, Sultan Adam al-wathiq Billah of Banjar reaffirmed the handover of these territories to the Dutch East Indies colonial administration. In 1846, the Dutch began to put a Resident Assistant in East Borneo at Samarinda (now the province of East Kalimantan and the eastern part of South Kalimantan) named H. Von Dewall. East Kalimantan was then part of the
Dutch East Indies The Dutch East Indies, also known as the Netherlands East Indies (; ), was a Dutch Empire, Dutch colony with territory mostly comprising the modern state of Indonesia, which Proclamation of Indonesian Independence, declared independence on 17 Au ...
. East Kalimantan with its then administrative area was established based on the Law No. 25 of 1956, originally only consisted of three regency-level special regions: Berau, Bulongan, and
Kutai Kutai is a historical region in what is now the Indonesian province of East Kalimantan on the island of Borneo. The region shares its name with the native ethnic group of the region (known as 'the Kutai people'), with a total population arou ...
; and the first governor was APT Pranoto.


Split of North Kalimantan province

North Kalimantan North Kalimantan () is a Provinces of Indonesia, province of Indonesia. It is located on the northernmost of Kalimantan, the Indonesian part of the island of Borneo. North Kalimantan borders the Malaysian states of Sabah to the north and Sarawa ...
was formally inaugurated as the 34th province of Indonesia on April 15, 2013. The new province was previously part of East Kalimantan Province.


New national capital

The province will host the future
capital city A capital city, or just capital, is the municipality holding primary status in a country, state (polity), state, province, department (administrative division), department, or other administrative division, subnational division, usually as its ...
of Indonesia that will be built on parts of Penajam North Paser and
Kutai Kartanegara Regency Kutai Kartanegara Regency (abbreviated as ''Kukar'') is a regency of East Kalimantan Province, Indonesia. It has a land area of 27,891.13 km2 and a water area of 4,097 km2, geographically located between 1°18′40″S and 116°31′3 ...
. The future capital is to be named Nusantara, with construction originally projected to start in 2020, and intended to conclude in 2024. However, at a hearing before Committee V of Indonesia's House of Representatives on 9 June 2020, a government representative asserted that the government had not allocated the 2022 budget for the project (for 2022, the ministry proposed a budget worth over 100.46 trillion rupiah - over 7 billion US$ - a steep reduction from the figure of 149.81 trillion rupiah in 2021). Earlier, the National Planning Development Authority had said that the total sum needed to move the capital from its current location in Jakarta to East Kalimantan province amounted to 486 trillion rupiah, of which 265.2 trillion will be mobilised through the public-private partnership (PPP), 127.3 trillion from private special funds, and 93.5 trillion from the state budget. But the Ministry of Finance said that the government switched its priorities to mitigating the effect of the
COVID-19 pandemic The COVID-19 pandemic (also known as the coronavirus pandemic and COVID pandemic), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), began with an disease outbreak, outbreak of COVID-19 in Wuhan, China, in December ...
. The ministry announced that it had not allocated budget for the new capital project. Nevertheless, the new national capital was formally inaugurated in August 2024.


Geography

East Kalimantan Province comprises a land area of 125,336.81 square kilometers and a comprehensive ocean management area of 25,656 km2, located between 113°44'E and 119°00'E, and between 2°33'N and 2°25'S. The province is divided into seven regencies (''kabupaten'') and three cities (''kota''), together subdivided into 105 districts (''kecamatan'') and then into 1,026 villages (rural ''desa'' and urban ''kelurahan''). The regencies (with their administrative capitals) and cities are enumerated below. East Kalimantan is one of the main gates to the eastern part of Indonesia. The area is also known as a storehouse of timber and mining, has hundreds of rivers (scattered across almost all regencies and cities) which area the main means of transportation in addition to land transport, with the longest river being the Mahakam. East Kalimantan borders
North Kalimantan North Kalimantan () is a Provinces of Indonesia, province of Indonesia. It is located on the northernmost of Kalimantan, the Indonesian part of the island of Borneo. North Kalimantan borders the Malaysian states of Sabah to the north and Sarawa ...
in the north,
South Kalimantan South Kalimantan () is a Provinces of Indonesia, province of Indonesia. It is the second most populous province on the island of Kalimantan, the Indonesian territory of the island of Borneo after West Kalimantan. The provincial capital was Banjar ...
in the south,
Central Kalimantan Central Kalimantan () is a provinces of Indonesia, province of Indonesia. It is one of five provinces in Kalimantan, the Indonesian part of Borneo. It is the largest province in Indonesia by area since 2022, bordered by West Kalimantan to the west ...
in the southwest, and
West Kalimantan West Kalimantan () is a province of Indonesia. It is one of five Indonesian provinces comprising Kalimantan, the Indonesian part of the island of Borneo. Its capital and largest city is Pontianak. It is bordered by East Kalimantan and Central ...
and
Sarawak Sarawak ( , ) is a States and federal territories of Malaysia, state of Malaysia. It is the largest among the 13 states, with an area almost equal to that of Peninsular Malaysia. Sarawak is located in East Malaysia in northwest Borneo, and is ...
in the west. It touches the
Celebes Sea The Celebes Sea ( ; ) or Sulawesi Sea (; ) of the western Pacific Ocean is bordered on the north by the Sulu Archipelago and Sulu Sea and Mindanao Island of the Philippines, on the east by the Sangihe Islands chain, on the south by Sulawes ...
and the
Makassar Strait Makassar Strait () is a strait between the islands of Borneo and Sulawesi in Indonesia. To the north it joins the Celebes Sea, while to the south it meets the Java Sea. To the northeast, it forms the Sangkulirang Bay south of the Mangkalihat P ...
in the east, with its large Mangkalihat Peninsula separating the two. There are hills in almost all districts, and there are numerous lakes. Most lakes are located in the Kutai Regency, with the most extensive lakes, Semayang and Melintang, having an area of 13,000 ha and 11,000 ha respectively.


Climate

Such as the climate of Indonesia in general, East Kalimantan tropical climate and has two seasons, dry and rainy seasons. The dry season usually occurs in May to October, while the rainy season in November to April. This situation continued every year interspersed with transitional season in certain months. Moreover, because of its location on the equator, the climate in East Kalimantan are also affected by wind monsoon, monsoon wind is November–April west and east monsoon winds from May to October. In recent years, the situation in East Kalimantan season is sometimes erratic. In the months that it is supposed to rain, there is no rain at all, or vice versa in the months that should be dry it rains for a much longer time.


Temperature and humidity

Temperatures somewhere high and low are determined by the area of the ocean surface and the distance from the beach. In general, East Kalimantan hot climates with temperatures in 2013 ranged from 21.6 °C in Berau October to 35.6 °C in Berau in September. Aside from being a tropical area with extensive forests, in 2013 the average humidity between 83 and 87 percent of East Kalimantan. The lowest air humidity observed by the meteorological station Samarinda happens in a few months with 82 percent humidity. While the highest occurred in Berau in February with 91 percent humidity.


Rainfall and wind conditions

Rainfall in East Kalimantan region varies by month and location of monitoring stations. Average highest rainfall recorded at the Meteorological Station Berau amounted to 245.1 mm and the lowest for the year 2013 was recorded at the Meteorological Station Samarinda is 237.8 mm. At some monitoring stations monitor wind conditions in East Kalimantan in 2013. Observations show that wind speeds between 3 and 4 knots. The highest wind speed was 4 knots in Balikpapan and Berau, while the lowest was 3 knots in Samarinda.


Government and administrative divisions


Administrative divisions

As of , East Kalimantan consists of 7 regencies and 3 cities (marked in bold), in turn divided into 105 districts. *
Balikpapan Balikpapan is a seaport city in East Kalimantan, Indonesia. Located on the east coast of the island of Borneo, the city is the financial center of Kalimantan. Balikpapan is the city with the largest economy in Kalimantan with an estimated 20 ...
* Berau *
Bontang Bontang is a city on the eastern coast of the island of Borneo in Indonesia, in the province of East Kalimantan. It occupies an area of , and the population was 140,787 at the 2010 census,Biro Pusat Statistik, Jakarta, 2011. and 178,917 at t ...
* East Kutai *
Kutai Kartanegara Kutai Kartanegara Regency (abbreviated as ''Kukar'') is a Regency (Indonesia), regency of East Kalimantan Province, Indonesia. It has a land area of 27,891.13 km2 and a water area of 4,097 km2, geographically located between 1°18′4 ...
* Mahakam Ulu * Paser * Penajam North Paser *
Samarinda Samarinda is the capital city of the Provinces of Indonesia, Indonesian province of East Kalimantan on the island of Borneo. The city lies on the banks of the Mahakam River with a land area of . Samarinda was one of Indonesia's top ten City qu ...
*
West Kutai West Kutai Regency () is a regency (''kabupaten'') in the Indonesian province of East Kalimantan. It previously covered a much greater area, with a population of 165,091 at the 2010 Census, but on 11 January 2013 the five northernmost districts we ...


Ecology

Illegal logging Illegal logging is the harvest, transportation, purchase, or sale of timber in violation of laws. The harvesting procedure itself may be illegal, including using corrupt means to gain access to forests; extraction without permission, or from a p ...
has removed much of the original forests of the province. Less than half the original forest remains in places such as the Kayan Mentarang and the
Kutai Kutai is a historical region in what is now the Indonesian province of East Kalimantan on the island of Borneo. The region shares its name with the native ethnic group of the region (known as 'the Kutai people'), with a total population arou ...
national parks. The projects that supports tropical rainforest conservation includes a WWF project and
Samboja Lestari Samboja Lestari is a Bornean orangutan (''Pongo pygmaeus'') rescue and rehabilitation centre, tropical rainforest restoration project, sun bear sanctuary, and eco-lodge located in the district of Samboja in Kutai Kartanegara Regency, East Kalimant ...
lodge, one of
Borneo Orangutan Survival The Borneo Orangutan Survival (BOS) Foundation is an Indonesian nonprofit non-governmental organization founded by Willie Smits in 1991 and dedicated to the conservation of the endangered Bornean orangutan (''Pongo pygmaeus'') and its habitat t ...
Foundation's reforestation and orangutan rehabilitation projects.


Economy

East Kalimantan's economy heavily depends on earth resources such as oilfield exploration, natural gas, coal and gold.
Balikpapan Balikpapan is a seaport city in East Kalimantan, Indonesia. Located on the east coast of the island of Borneo, the city is the financial center of Kalimantan. Balikpapan is the city with the largest economy in Kalimantan with an estimated 20 ...
has an oil refinery plant that was built by Dutch governance before World War II, destroyed during World War II, and rebuilt after Indonesian independence. Other developing economic sectors include agriculture and tourism. Obstacles to economic development include a lack of transportation infrastructure. Transportation depends on traditional boats connecting coastal cities and areas along main river,
Mahakam River The Mahakam River ( Indonesian: ''Sungai Mahakam'') is third longest river (with the third greatest volume discharge) in Borneo after the Kapuas River and the Barito River, it is located in East Kalimantan province of Indonesia. It flows from ...
. In 2012, Russia's state railway firm Joint Stock Company (JSC) signed a memorandum of understanding with the East Kalimantan governor over railway lines to transport coal and other freight. The first stage will connect an area near
Balikpapan Balikpapan is a seaport city in East Kalimantan, Indonesia. Located on the east coast of the island of Borneo, the city is the financial center of Kalimantan. Balikpapan is the city with the largest economy in Kalimantan with an estimated 20 ...
port to
West Kutai Regency West Kutai Regency () is a regency (''kabupaten'') in the Indonesian province of East Kalimantan. It previously covered a much greater area, with a population of 165,091 at the 2010 Census, but on 11 January 2013 the five northernmost districts we ...
in a 183-kilometer line and is estimated to cost about $1.8 billion. It will commence in 2013 and by 2017 it is hoped that it carry 20 million tons of coal annually. The second phase will connect a line to Murung Raya in
Central Kalimantan Central Kalimantan () is a provinces of Indonesia, province of Indonesia. It is one of five provinces in Kalimantan, the Indonesian part of Borneo. It is the largest province in Indonesia by area since 2022, bordered by West Kalimantan to the west ...
with a 60 kilometer line, which will cost an estimated $600 million. Several
oil field A petroleum reservoir or oil and gas reservoir is a subsurface accumulation of hydrocarbons contained in porous or fractured rock formations. Such reservoirs form when kerogen (ancient plant matter) is created in surrounding rock by the prese ...
s have been discovered in the
Mahakam River The Mahakam River ( Indonesian: ''Sungai Mahakam'') is third longest river (with the third greatest volume discharge) in Borneo after the Kapuas River and the Barito River, it is located in East Kalimantan province of Indonesia. It flows from ...
Delta Delta commonly refers to: * Delta (letter) (Δ or δ), the fourth letter of the Greek alphabet * D (NATO phonetic alphabet: "Delta"), the fourth letter in the Latin alphabet * River delta, at a river mouth * Delta Air Lines, a major US carrier ...
including Attaka, Badak (1971), Semberah, Nilam, Sanga Sanga, Bekapai (1972), Handil (1974), Samboja, Jakin and Sepinggan.Verdier, A.C., Oki, T., and Suardy, A., 1980, Geology of the Handil Field (East Kalimantan-Indonesia), in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa: American Association of Petroleum Geologists, , p. 401 The Handil, Badak and Bekapai fields are
anticline In structural geology, an anticline is a type of Fold (geology), fold that is an arch-like shape and has its oldest Bed (geology), beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex curve, c ...
structural trap In petroleum geology, a trap is a geological structure affecting the reservoir rock and caprock of a petroleum system allowing the accumulation of Hydrocarbon, hydrocarbons in a petroleum reservoir, reservoir. Traps can be of two types: stratigra ...
s with
oil reservoir A petroleum reservoir or oil and gas reservoir is a subsurface accumulation of hydrocarbons contained in Porosity, porous or fractured rock formations. Such reservoirs form when kerogen (ancient plant matter) is created in surrounding rock by t ...
sandstones Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed o ...
between 450 and 2900 m. The delta is in the Kutai basin, bounded by the Mankalihat and Paternoster carbonate arch, containing
Eocene The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...
shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of Clay mineral, clay minerals (hydrous aluminium phyllosilicates, e.g., Kaolinite, kaolin, aluminium, Al2Silicon, Si2Oxygen, O5(hydroxide, OH)4) and tiny f ...
s overlain by Oligocene
fluvial A river is a natural stream of fresh water that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of its course if it ru ...
deposits during
marine regression A marine regression is a geological process occurring when areas of submerged seafloor are exposed during a drop in sea level. The opposite event, marine transgression, occurs when flooding from the sea covers previously-exposed land. Descript ...
, culminating in the formation of the delta in the late
Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...
.


Demographics

Within the current boundary, East Kalimantan was populated by 3,028,487 people as of 2010.


Ethnicity

East Kalimantan is a major destination of migrants from Jawa, Sulawesi and South Kalimantan.With population of approximately 3.859 million, and area of 127,347 km2, the province is considered sparsely populated. The rest are other groups from various regions in Indonesia.


Language

People in East Kalimantan generally use Indonesian for official purposes and Banjarese for inter-ethnic communication. Due to the large number of Banjarese people in the province, their language became the main lingua franca, especially in cities like Samarinda and Balikpapan. Besides Banjarese, there is a significant presence of Javanese and Buginese speakers as well, due to the large migration of Javanese and Buginese people into the region. Other languages spoken in East Kalimantan are
Kutai Malay Kutai is a Malayic language spoken by 300,000 to 500,000 people. It is the native language of the Kutai people (, Kutai: ''Urang Kutai''), the indigenous ethnic group which lives along the Mahakam River in Borneo, especially in East Kalimantan, ...
(a distinct Malay variety closely related but distinct from Banjarese), Paser (a Northeast Barito language), Berau Malay, Tunjung,
Bahau Bahau is the principal town of Jempol District, Negeri Sembilan, Malaysia. Etymology The town's name is believed to have been derived from a Chinese phrase. Bahau's literal translation is "horse's mouth" while the nearby town, Mahsan means "hors ...
, Modang Lundayeh and more others. However, Kutai, Paser, and
Kenyah languages The Kenyah languages are a group of half a dozen or so closely related languages spoken by the Kenyah people, Kenyah peoples of Borneo. They are: : Kenyah language, Kenyah proper (a dialect cluster, incl. Madang), Sebob language, Sebob, Tutoh la ...
are considered under the threat of extinction.


Religion

According to the 2021 estimates, 3,320,000 people are Muslims, 286,150 are Protestants, 168,140 are Roman Catholics, 15,630 are Buddhists, 8,500 are Hindus and 308 are Confucians or adhere to folk religions. File:Masjid Islamic Centre Samarinda.jpg, Islamic Centre Samarinda File:Catholic Center Sangatta.JPG, Sangatta Catholic Church File:Vihara Eka Dharma Manggala Samarinda.jpg, Eka Dharma Manggala Buddhist temple


Art and culture


Traditional clothing

There are several types of traditional costume belonging to the ethnic groups of East Kalimantan. The traditional costumes of
Kenyah people The Kenyah people are an indigenous, Austronesian languages, Austronesian-speaking people of Borneo, living in interior North Kalimantan, North and East Kalimantan, Indonesia and Sarawak, Malaysia. Culture and economy The Kenyah people, ...
(Dayak) include ''sapei sapaq'' for males, which consists of a vest and tight pants known as ''abet kaboq'', and ''ta'a'' for females, which consists of a vest known as ''sapei inoq'' and a skirt. Other Dayak traditional garments include ''bulang kuurung'' (either short-sleeved or without) and its long-sleeved counterpart ''lengke'', and ''bulang burai king'', traditionally worn during ceremonies or tribal wars. Meanwhile, the Kutai people have their own costumes, namely ' / ''kustin'' and ''takwo'', formal costume traditionally worn by upper-middle classes and the nobility, and ''sakai'', a garment made from skin or wood fiber, traditionally only worn by women.


Traditional dance

East Kalimantan also has a variety of traditional dance. ''Punan Letto'', ''Datun Ngentau'', ''Hudoq'', ''Ganjur'', ''Gong'' / ''Kancet Ledo'', ''Burung Enggang'', ''Gantar'', ''Papatai'', ''Datun Julud'', and ''Leleng'' came from the Dayak people, while '' Jepen'' and ''Topeng Kemindu'' came from the Kutai people.


References

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