The Borgu Game Reserve is mostly made up of
savanna forest and has an area of , while the Zugurma Game Reserve is smaller, at . The two main parts of the park are separated by the
Kainji Lake, a long
reservoir. The Zugurma sector has no access roads and only the Borgu sector is used for tourism. The southern and western parts of the Borgu Game Reserve drain into the
Oli River, a tributary of the
Niger River, while the other parts drain directly into the lake via four small rivers. The Zugurma Game Reserve has little drainage; the smaller watercourses dry up during the dry season, but there are a number of permanent waterholes along the Oli River and elsewhere in the park. The Borgu sector consists of undulating hills with some
quartzite ridges and
ironstone pans, while the Zugurma sector consists of a low plateau, with soils derived from
sandstone, much eroded in places. The mean annual rainfall is about , with the wet season lasting from May to November and the dry season from December to April. ==Flora==