Gunung Mulu National Park

The park was gazetted in 1974 and inscribed on the UNESCO World Heritage List in 2000, meeting all four natural criteria. A 15-month Royal Geographical Society expedition in 1977 and 1978 drew international attention to its caves and launched the Mulu Caves Project, which has surveyed hundreds of kilometres of passages since. UNESCO records the Sarawak Chamber, about 600 m long, 415 m wide and 80 m high, as the largest known cave chamber in the world, and Deer Cave's passage as the largest known.

The park also holds about 3,500 vascular plant species and 17 vegetation zones. The Penan and Berawan peoples have long lived in the area, and both retain traditional hunting rights in designated parts of the park; Penan communities live near Batu Bungan and Long Iman.

Mulu has no road link to the rest of Sarawak for most visitors; life revolves around the airstrip, the river and the park. Penan and Berawan families live in villages around the park, and a small village with a clinic and primary school sits within the World Heritage Area. Many park guides come from local communities and share knowledge of plants, animals and traditional forest use.