Gunung Mulu National Park, Malaysia

This national park is located on the border between Brunei, Kalimantan and northern Sarawak in Malaysia. The core protection area covers 528.64 km². Mulu Mountain, which is known for its biodiversity and karst landscape, is a classic example of karst geomorphology in tropical regions. The park includes 17 plantations and more than 3,500 vascular plants. Palm species are unusually rich, with as many as 20 genera and 109 species recorded. At 2,377 m above sea level, the needle-like sandstone peaks of Mount Muroo overlook the park. The cave system that has been explored and developed underground is at least 295 km long and is home to millions of swiftlets and bats. The Sarawak Cave, which is 600 m long, 415 m wide, and 80 m long, is the largest known cave in the world.