Pangkalan Bun is the capital of West Kotawaringin Regency in Central Kalimantan Province, on Borneo, Indonesia. It is an agglomeration o…Pangkalan Bun is the capital of West Kotawaringin Regency in Central Kalimantan Province, on Borneo, Indonesia. It is an agglomeration of eight towns, all of which are part of South Arut District, with a combined population of 105,514 in mid 2023. It is also the administrative headquarters of South Arut District.