West Kalimantan () is a province of Indonesia. It is one of five Indonesian provinces in Kalimantan, the Indonesian part of the island of Borneo. Its capital city is Pontianak. The province has an area of 147,307 km² with a recorded population of 4,395,983 at the 2010 Census. Ethnic groups include the Dayak, Malay, Chinese, Javanese, Bugis, and Madurese. The latest official estimate (2019) is 5,069,127. The borders of West Kalimantan roughly trace the mountain ranges surrounding the 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 territory of Sarawak to the north.