West Kalimantan

West Kalimantan (Indonesian: Kalimantan Barat) 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 Census and 5,414,390 at the 2020 Census; 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. 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, but by mid 2025 it was officially estimated to have reached 5,766,030.