Lanjak Entimau Wildlife Sanctuary: Sarawak, Malaysia: 168,758 ha 

Most of Lanjak-Entimau remains inaccessible, and the means of entry is limited to difficult longboat journeys up various rivers such as the Lubang Baya, Engkari, Skrang, Ngemah, Poi and Katibas. 

There are only a limited number of access points. 

Batang Ai National Park: Sarawak: 1.1 million hectares 

Betung Kerihun National Park: West Kalimantan, Indonesia (800,000 ha) 

(source: (IUCN, Lanjak-Entimau Wildlife Sanctuary)