Siberut island (4.030 km sq) is the largest island of four islands in the Mentawaian archipelago. It is located about 155 kilometers off the coast of West Sumatra, across the Mentawaian strait.

The Mentawaian islands belong administratively to Kabupaten (Regency) Padang Pariaman in West Sumatra Province. Siberut is divided into two Kecamatan (district) : North and South Siberut with administrative centers at Muara Sikabaluan and Muara Siberut which also service as respectively market centers of Siberut.

According to Forestry Ministerial Decree (No. 407/Kpts II/93, dated 10-VII-93), a 190,500 hectares area was declared as Siberut National Park in 1993.