The Mentawai Islands Regency is a regency of West Sumatra Province which consists of a chain of about a hundred islands and islets approximately 150 kilometres (93 miles) off the western coast of Sumatra in Indonesia. They cover a land area of 6,033.76 km² and had a population of 76,173 at the 2010 Census^[3] and 87,623 at the 2020 Census;^[4] the official estimate as of mid-2022 was 89,401 - comprising 46,431 males and 42,970 females.^[1] Siberut at 3,838.25 square kilometres (1,482 square miles) is the largest of the islands. The other major islands are Sipura (or Sipora), North Pagai (Pagai Utara), and South Pagai (Pagai Selatan). The islands lie off the Sumatran coast, across the Mentawai Strait. The indigenous inhabitants of the islands are known as the Mentawai people. The Mentawai Islands have become a noted destination for surfing,^[5] with over 40 boats offering surf charters to international guests.^[6]

Quick Facts Kabupaten Kepulauan Mentawai, Country ...

Mentawai Islands Regency Kabupaten Kepulauan Mentawai
Regency
Coat of arms
Motto(s):  Musara Kasimaeru (Together for Goodness)
Location within West Sumatra
Mentawai Islands Regency Location in Sumatra and Indonesia Show map of Sumatra Mentawai Islands Regency Mentawai Islands Regency (Indonesia) Show map of Indonesia
Coordinates: 2°11′S 99°39′E
Country	Indonesia
Province	West Sumatra
Regency seat	Tua Pejat
Government
• Acting Regent	Martinus Dahlan
• Vice Regent	Vacant
Area
• Total	6,033.76 km2 (2,329.65 sq mi)
Population  (2023 estimate)[1]
• Total	92,122
• Density	15/km2 (40/sq mi)
Demographics [2]
• Religion	Christianity 79,94% - Protestanism 49% - Catholicism 30,94% Islam 19,56%
Time zone	UTC+7 (Indonesia Western Standard Time)
Area code	(+62) 759
Website	mentawaikab.go.id

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The Mentawai Islands have been administered as a regency within the West Sumatra (Sumatera Barat) province since 1999. The regency seat is Tua Pejat, on the island of Sipora. Padang, the capital of the province, lies on the Sumatran mainland opposite Siberut. The regency is divided into ten districts (kecamatan), tabulated below from south to north with their areas and their populations at the 2010 Census^[3] and the 2020 Census,^[4] together with the official estimates as at mid-2022.^[1] The table also includes the locations of the district administrative centres, the number of villages (all classed as rural desa) and the number of named offshore islands in each district, and its postcode.

Note: (a) Sikakap District covers the northern part of South Pagai Island and the southern part of North Pagai Island, plus some intervening small islands. Of the three desa, Matobek is entirely on North Pagai Island, while Sikakap and Taikato are mainly on North Pagai Island but each includes areas on South Pagai as well as the intervening small islands.

The islands have been separated from Sumatra since the mid-Pleistocene period, which has allowed at least twenty endemic species to develop amongst its flora and fauna. This includes six endemic primates: the Kloss's gibbon (Hylobates klossii), Mentawai macaque (Macaca pagensis), Siberut macaque (Macaca siberu), Mentawai langur (Presbytis potenziani), Siberut langur (Presbytis siberu), and pig-tailed langur (Simias concolor). They are highly endangered due to logging, unsustainable hunting, and conversion of rainforest to palm oil plantations.^[15] Some areas of the Mentawai Islands rainforest ecoregion are protected, such as the Siberut National Park. Red junglefowl, the Asian palm civet , and crab-eating macaque are also native.^[16]

The Mentawai Islands lie above the Sunda megathrust, a seismically active zone responsible for many great earthquakes. This megathrust runs along the southwestern side of Sumatra island, forming the interface between the Eurasian Plate and the Indo-Australian Plate.

Earthquake and tsunami activity has been high since the 2004 Indian Ocean earthquake. In 1833, the region was hit with an earthquake, possibly similar in size to the 2004 Indian Ocean earthquake;^[17] another large earthquake struck in 1797. On October 25, 2010, an earthquake in southern Sumatra led to a deadly tsunami that devastated villages in South and North Pagai.^[18] On March 3, 2016, an earthquake of 7.8 magnitudes occurred off the Indian Ocean, a few hundred kilometres from Mentawai islands, as a result of strike-slip faulting within the oceanic lithosphere of the Indo-Australia plate.^[19]

• Mentawai ethnic group
• Mentawai Festival