- The Mentawai Islands are a chain of about seventy islands and islets off the western coast of Sumatra where Siberut (4,030 km²) is the largest of these islands.
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The other major islands are Sipura, North Pagai (Pagai Utara) and South Pagai (Pagai Selatan). These islands lie approximately 150 km off the Sumatran coast, across the Mentawai Strait.
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The Mentawai Islands have been administered as a regency within the West Sumatra province since 1999.
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The regency (district) capital is Tua Pejat, on the island of Sipora.
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The regency is divided into ten districts:
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South Pagai
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Sikakap
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North Pagai
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South Sipora
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North Sipora
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South Siberut
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South West Siberut
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Middle Siberut
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North Siberut
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West Siberut