Gunung Leuser National Park is a national park covering 7,927 km2 in northern Sumatra, Indonesia, straddling the border of North Sumatra and Aceh provinces, a fourth portion and three fourths portion, respectively. The national park, settled in the Barisan mountain range, is named after Mount Leuser (3,119 m), and protects a wide range of ecosystems. An orangutan sanctuary at Bukit Lawang is located within the park. Together with Bukit Barisan Selatan and Kerinci Seblat national parks, it forms a World Heritage Site, the Tropical Rainforest Heritage of Sumatra.
Gunung Leuser National Park is 150 km long, over 100 km wide and is mostly mountainous. 40% of the park, mainly in the north-west, is steep, and over 1,500 m. This region is billed as the largest wilderness area in South-East Asia and offers wonderful trekking. 12% of the park, in the lower southern half, is below 600 meters. Eleven peaks are over 2,700 m. Mount Leuser (3,119 m) is the third highest peak on the Leuser Range. The highest peak is Mount 'Tanpa Nama' (3,466 m), the second highest peak in Sumatra after Mount Kerinci (3,805 m).
