Kayan Mentarang National Park (Indonesian: Taman Nasional Kayan Mentarang) is a densely forested national park located in the Indonesian province of North Kalimantan, on the island of Borneo. The national park is named after a great dispersed Mentarang mountain trails plateau of Apau Kayan which covers the entire park from Datadian area in south region to Apau Ping area in mid region until Long Bawan in north region. Kayan Mentarang National Park is located at the border between Indonesia and Malaysia. The park is central to the WWF Heart of Borneo initiative, which aims to protect the transboundary highlands of Borneo, which straddle the three Southeast Asian nations of Indonesia, Malaysia and Brunei Darussalam