Bengkalis Regency is a regency of Indonesia in Riau Province. The regency was originally established in 1956 and then included most of the northern part of the province, but on 4 October 1999 it was divided up, with most of the territory being split off to form the new Rokan Hilir Regency, Siak Regency and the city of Dumai. On 19 December 2008 a further five districts were removed to create the new Meranti Islands Regency, leaving eight districts in the Bengkalis Regency. These eight districts has increased since 2010 to eleven by the splitting of existing districts on the Sumatran mainland.
Solok Regency is an inland regency (kabupaten) of West Sumatra, Indonesia. It covers an area of 3,738 km2 and had a population of 348,566 at the 2010 Census and 391,497 at the 2020 Census; the official estimate as of mid-2022 was 397,829 - comprising 200,218 males and 197,611 females. The administrative centre of the regency is the town of Arosuka, in Gunung Talang District. The city of Solok is administratively separate from the Regency and its area and population are not included in these totals.
Prabumulih is a city in South Sumatra, Indonesia. It was originally part of Muara Enim Regency, from which it was separated to become an independent city on 21 June 2001. It has an area of 447.31 km² and had a population of 161,814 at the 2010 Census and 193,196 at the 2020 Census; the official estimate as at mid 2023 was 200,673. Geographically, this city is located at 3°25′58″S 104°14′8″E in the heart of the province, and it is surrounded on all sides by Muara Enim Regency, apart from a short stretch bordering Penukal Abab Lematang Ilir Regency.
Lahat Regency is a regency of South Sumatra province, Indonesia. It originally included much of the southwestern part of the province, but on 21 June 2001 the town of Pagar Alam was removed from the regency to become an independent city, and on 2 January 2007 the western districts were split off to form the new Empat Lawang Regency. The reduced regency now covers a total area of 4,361.84 km2 and had a population of 369,974 at the 2010 Census and 430,071 at the 2020 Census; the official estimate as at mid 2023 was 438,238. The city of Pagar Alam remains an enclave within the regency, but is administratively separate.
Batanghari is a regency of Jambi Province in Sumatra, Indonesia. It originally covered a wider area, but on 4 October 1999 this was split between a new Muaro Jambi Regency in the east and a reduced Batang Hari Regency in the west, which now covers an area of 5,804.83 km2. It had a population of 241,334 at the 2010 census and 301,700 at the 2020 census; the official estimate as at mid 2023 was 312,279. The administrative capital is the town of Muara Bulian.
West Kutai Regency is a regency (kabupaten) in the Indonesian province of East Kalimantan. It previously covered a much greater area, with a population of 165,091 at the 2010 Census, but on 11 January 2013 the five northernmost districts were split off to form a new Mahakam Ulu Regency; the residual area of West Kutai Regency is 20,384.6 km2, and it had a population of 140,097 at the 2010 Census, and 165,938 at the 2020 Census; the official estimate as at mid 2023 was 177,007. The town of Sendawar is the administrative capital.
Musi Banyuasin Regency is a regency of South Sumatra province, in Indonesia. Originally much larger, it was reduced by about 45% of its former area on 10 April 2002 by the splitting off of most of its eastern and northeastern districts to form the new Banyuasin Regency. It now has a total area of 14,265.96 km2 (5,508 sq mi) and a population of 561,458 at the 2010 Census and 622,206 at the 2020 Census; the official estimate as at mid 2023 was 707,290.
East Tanjung Jabung Regency is a regency of Jambi Province, Indonesia. It is located on the island of Sumatra. The regency was created on 4 October 1999 by the division of the then Tanjung Jabung Regency into eastern and western halves. It now has an area of 5,087.07 km2 and had a population of 205,272 at the 2010 census and 229,813 at the 2020 census; the official estimate as at mid 2023 was 236,727. The regency's administrative capital lies at the town of Muara Sabak, a riverine port near the mouth of the Berbak River.
West Tanjung Jabung Regency is a regency of Jambi Province, Indonesia. It is located on the island of Sumatra. The regency was created on 4 October 1999 by the division of the then Tanjung Jabung Regency into eastern and western halves. The western regency now has an area of 5,009.82 km2 and had a population of 278,741 as at the 2010 census and 317,498 at the 2020 census; the official estimate as at mid 2023 was 331,058. The regency seat is the town of Kuala Tungkal, a port at the mouth of the Tungkal River.
Seluma Regency is a regency of Bengkulu Province, Indonesia, on the west coast of the island of Sumatra. It was created on 25 February 2003 from what were formerly the northwestern districts of the South Bengkulu Regency. The regency seat is at the town of Pasar Tais. It covers an area of 2,479.36 km2, and had a population of 173,507 at the 2010 Census and 207,877 at the 2020 Census; the official estimate as at mid 2023 was 215,063.
Banyuasin is a regency of South Sumatra Province in Indonesia. The Regency was formed on 10 April 2002 from the coastal and eastern areas formerly part of the Musi Banyuasin Regency. It takes its name from the main river which drains that area, the Banyuasin River. Pangkalan Balai is the regency seat. The regency borders Musi Banyuasin Regency, Jambi province and Bangka Strait to the north, Bangka Strait to the east, Ogan Komering Ilir Regency, Muara Enim Regency, and the city of Palembang to the south, and Musi Banyuasin Regency to the west. It has an area of 12,551.15 km2 and had a population of 749,107 at the 2010 census and 836,914 at the 2020 census; the official estimate as at mid 2023 was 850,022. Much of the regency is coastal lowland.
Empat Lawang Regency is a regency of South Sumatra Province, Indonesia. It was created on 2 January 2007 from what had been formerly the western districts of Lahat Regency. It covers an area of 2,256.44 km² and had a population of 221,176 at the 2010 Census and 333,622 at the 2020 Census; the official estimate as at mid 2023 was 336,694. The regency seat is at the town of Tebing Tinggi.
Muara Enim Regency is a regency of South Sumatra Province, Indonesia. The regency seat is the town of Muara Enim. The city of Prabumulih is an administrative body separating the main part of Muara Enim to the south of the city from a smaller part to its north. The regency until late 2012 covered an area of 8,587.94 km² and had a population of 717,717 at the 2010 Census; however, on 14 December 2012 five districts from the Muara Enim Regency were split off to form the new Penukal Abab Lematang Ilir Regency.
Musi Rawas Regency is a regency of South Sumatra Province, Indonesia. Prior to 2013, it covered an area of 12,134.57 km2 and had a population of 524,919 at the 2010 Census; however on 10 June 2013 the northern half of the regency was split off to form a separate North Musi Rawas Regency. Previous to 2001, the Regency had also included the city of Lubuklinggau, which was split off to form an independent city outside the regency.
Ogan Ilir Regency is a regency of South Sumatra Province, Indonesia. It takes its name from the main river which stream that area, Ogan River. And the name Ilir means downstream. Indralaya is the regency seat. The regency borders Palembang City and Muara Enim Regency to the north, Ogan Komering Ilir Regency to the east, Ogan Komering Ilir Regency, and East Ogan Komering Ulu Regency to the south, and Muara Enim Regency to the west.
Ogan Komering Ulu Regency is a regency of South Sumatra, Indonesia. It formerly covered an area of 10,408 km2 with a population of around 1,000,000 people; however on 18 December 2003 parts of this area were split off to form separate regencies of East Ogan Komering Ulu and South Ogan Komering Ulu; the residual regency area covers just 4,797.06 km2 and had a population of 324,045 at the 2010 Census and 367,603 at the 2020 Census; the official estimate as at mid 2023 was 383,608. The administrative centre is the town of Baturaja.
East Ogan Komering Ulu Regency is a regency of South Sumatra Province, Indonesia. It was created on 18 December 2003 from what had formerly been the eastern districts of Ogan Komering Ulu Regency. It covers an area of 3,370 km2 and had a population of 609,982 at the 2010 Census and 649,853 at the 2020 Census; the official estimate as at mid 2023 was 684,560. The regency seat is the town of Martapura. It borders Ogan Ilir Regency to the north, Ogan Komering Ulu Regency to the west, Ogan Komering Ilir Regency in the east and Lampung Province and South Ogan Komering Ulu Regency in the south.
Musi is a Malayic variety spoken primarily in parts of South Sumatra, Indonesia. While the name Musi in the broad sense can also refer to the wider Musi dialect network comprising both Upper Musi and Palembang–Lowland clusters, it is locally used as an endonym specific to the variety spoken in the upstream parts of Musi River.
Penukal Abab Lematang Ilir Regency is a regency of South Sumatra Province, Indonesia. It takes its name from the three main rivers which flow through that area - the Penukal River, Abab River and Lematang River - while the name Ilir means "downstream". The town of Talang Ubi is the administrative centre of this regency. The regency borders Musi Banyuasin Regency to the north, Banyuasin Regency, and Muara Enim Regency to the east and the south, and by Musi Rawas Regency, and Muara Enim Regency to the west.
North Musi Rawas Regency is a regency of South Sumatra Province, Indonesia. It takes its name from the two main river which drain that area, Musi River and Rawas River. This regency was created on 10 June 2013 by splitting off the seven northernmost districts of Musi Rawas Regency.
Indonesia 
South Sumatra 
Penukal Abab Lematang Ilir 
