Mahakam Ulu Regency

Mahakam Ulu Regency is a regency (kabupaten) in the province of East Kalimantan, Indonesia. As the name implies, it comprises the upper valley of the Mahakam River. It covers an area of 18,427.81 km2. The regency was established on 14 December 2012, formed from the former northern districts of West Kutai Regency. The districts now forming the regency held a combined population of 24,994 at the 2010 Census; the population for the new regency at the 2020 Census was 32,513; the official estimate as at mid 2023 was 38,498. The administrative capital is at Ujoh Bilang. It is the only regency in East Kalimantan to share an international land border with the Malaysian state of Sarawak.

Administrative districts
The regency is divided into five districts (kecamatan), tabulated below with their areas and their populations at the 2010 Census and 2020 Census, together with the official estimates as at mid 2023. Notable villages include the twin villages of Tiong Ohang and Tiong Bu'u in Long Apari District. The table also includes the locations of the district administrative centres, the number of administrative villages (all classed as kampung or desa) in each district, and its post code.