hours to reach Camp 5. From Camp 5, there is an 11.2 km trail leading to Kuala Terikan which could last for four to five hours. The climbers can either choose to stay at a ranger station Nanga Metawai (15 minutes from Kuala Terikan) or a longhouse named Rumah Bala Lesong (three to four hours by longboat). After that, a boat ride further downriver would reach Nanga Medamit where there is a road leading to Limbang. The Gunung Mulu Summit trek is the only trek to reach the summit of Mount Mulu. The summit is located at 24 km away from the park headquarters. The trek starts from the national park headquarters to reach Camp 3. It is a 12 km hike through the primary forests with an elevation of 1,200 metres. The mossy forest starts from Camp 3. It will be a few hours to climb to reach Camp 4. After Camp 4, there are a few vertical climbs which requires knotted ropes which eventually leads to the summit. Camp 1 is located along the descending trek from the summit of Mount Mulu. There is another 3-hour hike to reach the park headquarters from Camp 1. Management and facilities The Protected Areas and Biodiversity Conservation (PABC) Unit of the Sarawak Forestry Corporation is responsible for the management Totally Protected Areas (TPA) of Gunung Mulu National Park which covers 90% of the park area and is closed to the public. The remaining 10% of the park area is opened to visitors and is managed by Borsarmulu Park Management Sdn Bhd. Since 1974, the Sarawak government has limited access to the national park by not building any roads. This is to preserve the park's ecological integrity and its resources. Legislation such as National Parks and Nature Reserves Ordinance of 1998 and National Parks and Nature Reserves Regulations of 1999 had been enacted to regulate the management of the park. 90% of the park and 95% of the caves are closed to visitors except for research purposes. There are only four show caves opened to public: Clearwater Cave, Wind Cave, Deer Cave, and Lang's Cave. All visitors require a permit and a park guide. Visitors are required to organise into groups of ten with visiting intervals of 20 minutes at the four show caves. On the other hand, there are seven caves available for adventurous caving in groups of six if properly