Gomantong Forest Reserve is a protected forest reserve in Sandakan and Kinabatangan Districts of Sandakan Division, Sabah, Malaysia.[2] It was designated as a Class 1 Protection Forest by the Sabah Forestry Department in 1984. Its area is 3,297 hectares (32.97 km2).[3] The Gomantong Caves are within the reserve. Gomantong's terrain consists of low to moderate hills and flat areas with swamps. The forest is a mixture of dipterocarp and swamp forest.[1]