West Kalimantan (, Jawi: کليمنتن بارت) 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 Kalimantan to the east, the Malaysian state of Sarawak to the north, and the Bangka Belitung Islands to the west and the Java Sea to the south. The province has an area of 147,018 km2, and had a population of 4,395,983 at the 2010 CensusBiro Pusat Statistik, Jakarta, 2011. and 5,414,390 at the 2020 Census;Badan Pusat Statistik, Jakarta, 2021. the official estimate as at mid 2025 was 5,766,030 (comprising 2,957,074 males and 2,808,956 females), and was projected to rise to 5,834,955 at mid 2026.Badan Pusat Statistik, Jakarta, 27 February 2026, Provinsi Kalimantan Barat Dalam Angka 2026 (Katalog-BPS 1102001.61) Ethnic groups include the Dayak, Malay, Chinese, Javanese, Bugis, and Madurese. The borders of West Kalimantan roughly trace the mountain ranges surrounding the vast watershed of the Kapuas River, which drains most of the province. The province shares land borders with Central Kalimantan to the southeast, East Kalimantan to the east, and the Malaysian state of Sarawak to the north.
West Kalimantan is nicknamed "The Province of a Thousand Rivers". The nickname references the geography of the province, which features hundreds of rivers of varying size, most of which are navigable. Several major rivers are still the main route for freight to the hinterland, despite road infrastructure now reaching most districts.
Although a small part of West Kalimantan region is seawater, West Kalimantan has dozens of large and small islands (mostly uninhabited) spread along the Karimata Strait and Natuna Sea that borders the province of Riau Islands. The total population in the province, according to the 2010 census totalled 4,395,983 inhabitants and at the 2020 Census it was 5,414,390,Badan Pusat Statistik, Jakarta, 2021. but by mid 2025 it was officially estimated to have reached 5,766,030.Badan Pusat Statistik, Jakarta, 27 February 2026, Provinsi Kalimantan Barat Dalam Angka 2026 (Katalog-BPS 1102001.61)
History The history of West Kalimantan was dominated with Hindu and Buddhist kingdoms ruling over the region and Borneo as a whole after that this kingdoms converted into muslim sultanate.
Its modern history in 17th century. The Malays are the native Muslims of West Kalimantan and established their Sultanates of Sambas since 1609 in Sambas territory, along with Mempawah Sultanate established since 1740 ruled in between Pontianak and Sambas territory. The Mempawah Sultanate brought in workers from China at the beginning of the kingdom. The same policy followed by the Sambas Sultanate around 1750, which brought in workers from China to work in the gold mines in the area.
The high Chinese population in this province was due to a republic founded by Chinese miners called the Lanfang Republic (蘭芳共和國: Republik Lanfang), an autonomous state allied with Pontianak and Sambas Sultanate, as a sub-state of the Qing. The government of Lanfang was ended in West Kalimantan after the Dutch Invasion in 1884.
West Kalimantan was under Japanese occupation from 1942 to 1945, when Indonesia declared its Independence. During the Japanese occupation, more than 21,000 people in Pontianak (including sultans, men, women and children) were kidnapped, tortured and massacred by Japanese troops during the Pontianak incidents. All the Malay Sultans on Kalimantan were executed and the Malay elite was devastated by the Japanese. Most of the victims were buried in several giant wells in Mandor (88 km from Pontianak). After the end of the war, Japanese officers in Pontianak were arrested by allied troops and brought in the International Military Tribunal for the Far East.
A monument called Makam Juang Mandor was created to memorialize the event.
On 12 May 1947, the West Kalimantan Autonomous region was established. It was led by Syarif Hamid II of Pontianak, who supported the Dutch endeavour to establish a federal United States of Indonesia (RUSI), of which West Kalimantan would have been a component. Following the 5 April 1950 arrest of Sultan Hamid for complicity in the APRA coup attempt against the RUSI government led by Royal Netherlands East Indies Army (KNIL) officer Raymond Westerling, there were demands from the public for a merger into the Republic of Indonesia, which took place on 22 April. On 15 August, The West Kalimantan autonomous region became part of Kalimantan Province, and two days later, the RUSI ceased to exist, and was replaced with a unitary Republic of Indonesia.
West Kalimantan was the site of substantial fighting during the Indonesia-Malaysia confrontation under the Sukarno government in the mid-1960s. After Suharto deposed Sukarno in 1965, the confrontation was quickly resolved. Domestic conflict continued, however, for another ten years between the new Suharto government and fighters organized during the confrontation and backed by the banned Indonesian Communist Party (PKI). In 1967, Dayak locals waged a campaign of ethnic cleansing against the ethnic Chinese in the interior regions, with support from the Indonesian military, who believed the Chinese were aiding the communists. Thousands of Chinese were killed in the massacres, and tens of thousands became refugees.
Many Madurese migrants moved into the former Chinese lands, leading to renewed ethnic rivalries with the local population. These tensions eventually culminated in major eruptions of violence in 1996-1997 during the Sanggau Ledo riots and in 1999 during the Sambas riots. Hundreds of people, mostly Madurese, were killed during the riots and tens of thousands of Madurese became refugees. These riots also resulted in the ethnic cleansing of the Madurese from the Sambas region.
Geography
Boundary West Kalimantan Province is located in the western part of the island of Borneo, or in between the lines 2°08'N and 3°05'S and between 108°0'E and 114°10'E. The province is traversed by the Equator (latitude 0°), precisely through the city of Pontianak. West Kalimantan has a tropical climate, with often high temperatures accompanied by high humidity.
Other specific characteristics are that the West Kalimantan region is one of the provinces in Indonesia which has a land border with another country, namely the State of Sarawak, East Malaysia. Even with this position, West Kalimantan is currently the only province in Indonesia that have officially has an access road to get in and out of a neighbouring country. West Kalimantan and Sarawak have open roads approximately 400 km long, spanning Pontianak-Entikong-Kuching (Sarawak, Malaysia) and can be reached about six to eight hours of travel. In the northern part of the province, there are four regencies that directly borders Malaysia, namely Sambas, Sanggau, Sintang, and Kapuas Hulu, which stretch along with the Kalingkang Mountains-Kapuas Hulu.
Most of West Kalimantan is low-lying land, with a total area of 147,018 km2, or 7.53 percent of the total Indonesian land area or 1.13 times the size of the island of Java. This region stretches straight from north to south along more than 600 km and about 850 km from west to east. Following the splitting up of the former unified Papua province, West Kalimantan is Indonesia's second largest province by area, after Central Kalimantan (153,430.36 km2). The largest regency is Kapuas Hulu (31,318 km2 or 21.3 percent of the provincial area), followed by Ketapang (30,012 km2 or 20.4 percent) and Sintang (22,026 km2 or 15.0 percent), with the rest spread over the nine other regencies and two cities.
Topology In general, West Kalimantan land is low-lying and has hundreds of rivers are safe when navigable, slightly hilly which extend from west to east along the valley Kapuas and Natuna Sea / Strait Karimata. Most of the land area is a swampy mix of peat and mangrove forests. The land area is flanked by two mountain ranges, namely, Kalingkang Mountains in the North and the Schwaner Mountains in the south along the border with the province of Central Kalimantan. Judging from the soil texture, the majority of West Kalimantan's area consists of the soil type PMK (podsolic red-yellow), which covers an area of about 10.5 million hectares, or 17.28 per cent of the total area of 14.7 million hectares. Next, the ground OGH (organosol, gley and hummus) and the alluvial soil of about 2.0 million hectares, or 10.29 per cent sprawled across Dati II, but most likely in the coastal district.
Influenced by the vast lowlands, the heights of the mountains are relatively low as well as non-volcanically active. The highest mountain is Mount Baturaya in Serawai District of Sintang Regency which has an altitude of 2,278 metres above sea level, far lower than Mount Semeru (East Java, 3,676 metres) or Mount Kerinci (Jambi, 3,805 metres).
Mount Lawit is located in Kapuas Hulu District, Embaloh Hulu and more formerly known in West Kalimantan. It only is the third highest because it has a high 1,767 metres, while the second highest is Mount Batusambung (in Ambalau District) with a height of up to 1,770 metres.
Lakes and Rivers West Kalimantan is an area that could be called "The Thousand Rivers Province". The nickname is in line with the geographical conditions that have hundreds of large and small rivers, among others, which can be and often are navigable. Several major rivers are still the lifeblood and mainline to transport the countryside, although the road infrastructure has been able to reach most districts.
The longest river is the Kapuas River(or sungai Kapuas), which is the longest river in Indonesia (1,086 km), along which 942 km are navigable. Other great rivers are the Melawi, (navigable 471 km), Pawan (197 km), Kendawangan (128 km), Jelai (135 km), Sekadau (117 km), Sambas (233 km ), and Landak (178 km).
Although rivers are very numerous in West Kalimantan, there are only two significant lakes in the province. These are Lake Sentarum and Lake Luar I, which are in Kapuas Hulu. Lake Sentarum has an area of 117,500 hectares, which sometimes is almost dry in the dry season, and Lake Luar I, which has an area of approximately 5,400 hectares. Both of these lakes have potential as tourist attractions.
Government and administrative divisions
Until 1999 the province was composed of six regencies (kabupaten) - Sambas, Pontianak, Ketapang, Kapuas Hulu, Sanggau and Sintang - and the independent City (kota) of Pontianak. A seventh regency, Bengkayang, was formed on 20 April 1999 from part of Sambas Regency, and an eighth, Landak, was formed on 4 October 1999 from part of Pontianak Regency. A second independent city, Singkawang, was formed on 21 June 2001 from part of Bengkayang Regency. On 18 December 2003 Sekadau Regency was cut out of Sanggau Regency, and Melawi Regency was cut out of Sintang Regency, while on 2 January 2007 North Kayong Regency was cut out of Ketapang Regency, and on 17 July 2007 Kubu Raya Regency was cut out of Pontianak Regency. In 2014 the residual part of Pontianak Regency was re-named as Mempawah. West Kalimantan is thus now subdivided into two cities and twelve regencies. About 29 per cent of the province's population lives in the Greater Pontianak area. The capitals, areas and populations at the 2010 and 2020Badan Pusat Statistik, Jakarta, 2021. Censuses (as well as the official estimates as at mid 2025Badan Pusat Statistik, Jakarta, 27 February 2026, Provinsi Kalimantan Barat Dalam Angka 2026 (Katalog-BPS 1102001.61) of the regencies and cities are: