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South Barito Regency is a regency in Central Kalimantan province of Indonesia. On 10 April 2002 the eastern districts were split off to create a new East Barito Regency, while the residual South Barito District has an area of 7,020 km2. The regency seat is located in the town of Buntok, located in South Dusun district. The population of South Barito Regency was 124,128 at the 2010 Census and 131,140 at the 2020 Census; the official estimate as at mid 2025 was 137,055 (comprising 69,940 males and 67,710 females).

Mayoritas masyarakat yang tinggal di daerah ini adalah Suku Dayak, terdiri dari Suku Dayak Ngaju, Dayak Bakumpai, Dayak Maanyan, Dayak Lawangan, Dayak Dusun, dan Dayak Bawo.

Data penduduk Kabupaten Barito Selatan pada 2024 berdasarkan agama dan kepercayaan kepada Tuhan Yang Maha Esa yang dianut adalah:

It was part of Sultanate of Banjar, but ceded to Dutch East Indies in 1849. The region was previously known as Dusun Ilir. Later, the region became part of Kewedanan Barito Hilir, which the new Indonesian government inherited after independence. Later together with Kewedanan of East Barito, it was merged into single Barito Regency under newly formed Central Kalimantan province with capital in Muara Teweh. However, it was split again into several regencies in January 1959, becoming South Barito and North Barito.

Land formation in the regency is considered old and relatively not considered fertile. Soil mostly consist of alluvium sediments from rivers and peat in swamp regions, with little to no volcanic material. Alluvium sediments were found along the banks of Barito river, making around 41.5% of soil formation in the regency, while further from the river other soil type such as regosol could be found.

Regency's topography is flat and low-lying but on the most part except on northern parts where mountain ranges could be found. The regency's low-lying regions are wetlands and swamps with little variations.

Buntok has a tropical rainforest climate (Af) with heavy rainfall year-round. Temperature is relatively warm during the day up to 34 Celsius and could be as low as 20 Celsius at night. Rainfall yearly average is recorded on 325.6 milliliters and wind speed on 4.3 knots. June is the wettest month with recorder average of 720.9 milliliters of rainfall while the driest month is in August with just 81.9 milliliters.