Maliau Basin or also Maliau Basin Conservation Area, is a region in Sabah, Malaysia, which represents a geological catchment surrounding the Maliau River. Located around the center of Sabah in the Sandakan Division, it was designated as a conservation area by the Sabah Foundation (Yayasan Sabah) in 1981. Later in 1997 the Sabah State Assembly gazetted the Basin as a Protection Forest Reserve (Class I) with a total area of 588 square kilometres. The region also features Mount Lotung (1667 metres), Maliau Falls, and Lake Linumunsut.