Siberut National Park, National park in Mentawai Islands, West Sumatra, Indonesia.

Siberut National Park covers dense rainforests, mangroves, and swamps across Siberut Island in the Mentawai Islands. The landscape supports numerous plant and animal species adapted to this tropical forest ecosystem through long periods of isolation.

Protection began in 1976 with the 6,500-hectare Teitei Batti Wildlife Refuge, expanded to 56,500 hectares and upgraded to Nature Reserve status in 1979. UNESCO declared the whole island a biosphere reserve in 1981, and in 1993 the 190,500-hectare Siberut National Park was established by Forestry Ministerial Decree 407/Kpts-II/1993.

The Mentawai, the island's indigenous inhabitants, still follow hunter-gatherer traditions. Their forest use follows natural cycles: they plant trees, harvest fruit, and leave trunks standing until they fall on their own. Anthropologists describe their culture as a Neolithic survival.

Visitors reach the park by boat from Padang to Siberut Island, where local guides lead walks on forest trails. It is best to explore with a guide who knows the paths and understands the local environment.

The park protects four endangered endemic primates: Kloss's gibbon, the Siberut macaque, the Siberut langur and the pig-tailed langur. Among the 31 mammal species recorded are also four endemic squirrels, and 19 of the 134 bird species are endemic, including the Mentawai scops owl.