Mount Mulu, Mountain summit in Sarawak, Malaysia

Mount Mulu is a mountain summit in Sarawak, Malaysia, rising within Mulu National Park and built from layers of sandstone and shale. Its slopes are steep and densely forested, making the peak invisible from below until the final stages of the climb.

The first recorded ascent took place in 1932, led by a local guide named Tama Nilong who had found the route himself. The path he established remains the one climbers follow today.

The Berawan hunter Tama Nilong found the south-west ridge that leads to the summit in the 1920s, and in 1932 he guided Lord Shackleton and an Oxford University expedition up it. His route is still the only trek to the top, and Berawan guides remain the custodians of that knowledge.

The guided trek to the summit usually runs four days and three nights, with forest huts at Camp 1, Camp 3 and Camp 4; there is no Camp 2. The huts have cooking facilities, toilets and rainwater, and each camp has a helipad for emergencies and supplies. The trail is marked with red and white blazes.

Five pitcher plant species have been recorded on Mount Mulu: Nepenthes hurrelliana, N. lowii, N. muluensis, N. tentaculata and N. vogelii. The mountain's limestone karst and isolated peaks also shelter many endangered plants and animals, and its plant communities shift from lowland dipterocarp forest up to montane vegetation.