Gunung Leuser National Park is a national park covering 7,927 km2 in northern Sumatra, Indonesia, straddling the border of Aceh and North Sumatra provinces, a fourth portion and three-fourths portion, respectively. The national park, settled in the Barisan mountain range, is named after Mount Leuser, and protects a wide range of ecosystems. An orangutan sanctuary at Bukit Lawang is located within the park.