This World Heritage Site has the 2nd highest mountain peak in Sarawak, and boasts of having its tropical karsts as the most studied in the world. Gunung Mulu National Park also has very high biodiversity, and has one of the most extensive limestone cave systems on earth. The gigantic limestone caves serve as the roosting areas of millions of swiftlets and bats.
The Park covers 52,865 hectares; 100 km inland from the coastal port of Miri in Sarawak, Malaysia.