Gunung Mulu National Park, situated in the Malaysian State of Sarawak on the island of Borneo,is important for its biodiversity and karst features. Listed as a natural world heritage site, this park is dominated by Gunung Mulu, a 2,376 m-high sandstone pinnacle and the property is the most studied tropical karst area in the world. Within Mulu National Park lies the biggest underground cave chamber of the world; Sarawak Chamber (part of Good Luck Cave). The 52,864-ha park contains 17 vegetation zones, exhibiting some 3,500 species of vascular plants and a home to millions of bats and cave swiftlets. Mulu national park is a place rich in biodiversity and limestone covered by the flora and fauna.

• Listed as a UNESCO site in November 2000 due to its dramatic landscape and biological importance.