Pekanbaru is the capital city of the Indonesian province of Riau, and a major economic centre on the eastern side of Sumatra Island with its name derived from the Malay words for 'new market' . It has an area of 632.26 km2 (244.12 sq mi), with a population of 897,767 at the 2010 Census, and 983,356 at the 2020 Census; the official estimate as at mid 2023 was 1,123,348. It is located on the banks of the Siak River, which flows into the Strait of Malacca, Pekanbaru has direct access to the busy strait and has long been known as a trading port.
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.
Karo Regency is a landlocked regency of North Sumatra Province of Indonesia, situated in the Barisan Mountains. The regency, which was established on 7 November 1956, covers an area of 2,127.25 square kilometres (821.34 sq mi) and according to the 2010 census it had a population of 350,479, increasing to 404,998 at the 2020 Census; the official estimate as at mid-2023 was 420,799, comprising 208,600 males and 212,200 females. 60.99% of the regency is forested. Its regency seat is the town of Kabanjahe. The Batak Karo language is spoken in the regency, as well as the Indonesian language. It borders Southeast Aceh Regency in Aceh to the west, Deli Serdang Regency and Langkat Regency to the north, Dairi Regency and Toba Samosir Regency to the south, and Deli Serdang Regency and Simalungun Regency to the east.
Sumedang Regency is a landlocked regency (kabupaten) of the West Java Province of Indonesia. The regency covers an area of 1,558.72 km2 and had a population of 1,093,602 at the 2010 Census and 1,152,507 at the 2020 Census; the official estimate as of mid-2023 was 1,178,235 - comprising 593,815 males and 584,420 females. Its administrative centre is in the district of North Sumedang.
Indragiri Hilir is the most eastern regency (kabupaten) of Riau Province, Indonesia. It is located on the island of Sumatra. The regency has an area of 13,136.14 km2 and had a population of 661,779 at the 2010 census and 654,909 at the 2020 Census; the official estimate as at mid 2023 was 695,571. The administrative centre of the regency is the town of Tembilahan.
Indragiri Hulu is a landlocked regency (kabupaten) of Riau, Indonesia. It is located on the island of Sumatra. The original regency was split in two on 4 October 1999, with the western half being created as a separate Kuantan Singingi Regency. The regency now has an area of 8,198.71 km2 and had a population of 363,442 at the 2010 census, 408,704 at the 2015 census and 444,548 at the 2020 census; the official estimate as at mid 2023 was 472,799. The administrative seat of the regency is located at the town of Rengat.
Rokan Hilir is a regency (kabupaten) of Riau Province, on Sumatra island, Indonesia. It was formed on 4 October 1999 from districts which had previously been the northwestern part of Bengkalis Regency. It occupies the lower part of the catchment area of the Rokan River, and has an area of 8,851.59 km2. It had a population of 553,216 at the 2010 census and 637,161 at the 2020 census; the official estimate as at mid 2023 was 662,546. The administrative centre of the Rokan Hilir Regency is located at the town of Bagansiapiapi.
Banjar Regency is one of the eleven regencies in the Indonesian province of South Kalimantan; the capital is Martapura. It covers an area of 4,668.5 km2, and had a population of 506,839 at the 2010 Census, and 565,635 at the 2020 Census; the official estimate as at mid 2023 was 575,115. It lies immediately to the east of the city of Banjarmasin and north of the city of Banjarbaru, which it surrounds on the latter's west, north and east sides; the regency capital of Martapura is immediately north of Banjarbaru, of which it is effectively an extension. This regency is noted for its diamond mines and its people's religiosity. Motto: "Barakat" (Banjarese:"Blessing").
South Hulu Sungai Regency is one of the regencies (kabupaten) in South Kalimantan province, Indonesia. It had an area of 1,804.94 km2, and a population of 212,485 at the 2010 Census and 228,006 at the 2020 Census; the official estimate as at mid 2023 was 237.319. The capital of the regency is the town of Kandangan, which is famous for its culinary ketupat Kandangan.
Central Hulu Sungai Regency is one of the regencies in the Indonesian province of South Kalimantan. The area is 1,770.77 km2 and the population was 243,460 at the 2010 Census and 258,721 at the 2020 Census; the official estimate as at mid 2023 was 268,360. The administrative centre is the town of Barabai.
Tabalong Regency is the most northerly of the regencies in the Indonesian province of South Kalimantan, on Borneo Island. It was created on 14 July 1965 by splitting off the former northern districts of North Hulu Sungai Regency. It has a land area of 3,553.36 km2, and had a population at the 2010 Census of 218,620 and 253,305 at the 2020 Census; the official estimate as of mid-2023 was 262,631. The administrative capital is the town of Tanjung. The Regency's motto is "Saraba Kawa".
Tanah Bumbu is one of the regencies in the Indonesian province of South Kalimantan. It was formerly part of Kotabaru Regency, but was split off on 25 February 2003 to form a separate regency, following dissatisfaction on the Kalimantan mainland territories with administration from Laut Island. It covers an area of 4,890.3 km2 and had a population of 267,929 at the 2010 Census and 322,646 at the 2020 Census; the latest official estimate is 343,741. The regency's capital is the town of Batulicin.
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(Bulian Estuary or Bulian Delta).
Selat Panjang is the capital of Kepulauan Meranti Regency, which is part of the province of Riau in Indonesia. The regency is a new regency in Riau province which was established on 19 December 2008 after being separated from Bengkalis Regency. The city is located on Tebing Tinggi Island, which is separated by a narrow channel from Sumatra, and across the Strait of Malacca from Singapore.
North Labuhanbatu Regency is a regency of North Sumatra, Indonesia, created on 21 July 2008 by being carved out of the north-western districts of the existing Labuhanbatu Regency, which until 2008 covered an area of 9,703 square kilometres and had a population of 840,382 according to the 2000 census. 60.99% of the regency is forested. The new North Labuhanbatu Regency covers 3,545.8 square kilometres and had a population of 331,660 at the 2010 Census, rising to 381,994 at the 2020 Census; the official estimate as at mid 2023 was 401,863 . The Kualuh River is located in this regency. The administrative centre of the regency is at the town of Aek Kanopan.
Paniai Regency is one of the regencies (kabupaten) in Central Papua Province of Indonesia. It is named after the Paniai Lakes. It covers an area of 6,525.25 km2, and had a population of 153,432 at the 2010 Census and 220,410 at the 2020 Census; the official estimate as of mid-2022 was 227,254 - comprising 124,260 males and 102,994 females. The administrative centre is the town of Enarotali, in East Paniai.
Nabire Regency is one of the regencies (kabupaten) in the Indonesian province of Central Papua. It covers an area of 12,075.00 km2, and had a population of 129,893 at the 2010 Census and 169,136 at the 2020 Census, comprising 87,688 males and 81,448 females. The official estimate as at mid 2023 was 174,427. The town of Nabire, which faces onto Cenderawasih Bay, is the regency seat.
Meranti Islands is an archipelago, most of which forms a regency (kabupaten) of Riau Province and lies off the eastern coast of the island of Sumatra, Indonesia. It was created on 19 December 2008 by the separating of these large islands from the mainly mainland regency of Bengkalis. The regency comprises the islands of Tebing Tinggi, Rangsang, Padang, and Merbau, together with minor offshore islands, but does not include Bengkalis Island to the north, which is geographically part of the archipelago but remains within Bengkalis Regency. The principal town is Selat Panjang on Tebing Tinggi Island. The regency covers an area of 3,623.93 km2 and had a population of 176,290 at the 2010 Census and 206,116 at the 2020 Census; the official estimate as of mid-2023 was 211,771.
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.
Indonesia 
