Kotawaringin Sultanate

Kotawaringin, or also spelled Kota Waringin, was a sultanate on the south coast of Borneo. It covered an area in what is now the western part of the Indonesian province of Central Kalimantan. It then had a brief existence as an autonomous "native state" in the United States of Indonesia between 1949 and 1950, before being formally created as a separate Kotawaringin Regency within what was then the Province of South Kalimantan (from which the western part (then consisting of three regencies - the kabupaten of Barito, Kapuas, and Kotawaringin) was split off in 1957 to form the new Central Kalimantan province). However, on 26 June 1959, Kotawaringin Regency was divided into a West Kotawaringin Regency and East Kotawaringin Regency.