It is situated in the southwest of the province, bordering Central Kalimantan province to its immediate west and separated from Banjarmasin city to its east by the lower reaches of the Barito River.

The Regency is divided into seventeen districts (Indonesian: kecamatan), tabulated below with their areas and population totals from the 2010 Census[2] and 2120 Census,[3] together with the official estimates for mid 2023.

[1] The twelve most southern of the districts lie within the official Banjarmasin metropolitan area; the other five districts (Barambai, Bakumpai, Marabahan, Tabukan and Kuripan) lie outside the metropolitan area.

The table also includes the locations of the district administrative centres, the number of administrative villages in each district (a total of 195 rural desa and 6 urban kelurahan), and its postal codes.

Note: (a) including 3 small offshore or riverine islands.