Gazetted from 2 reserves in 1991, it is the largest national park in Nigeria covering 6402 km² (2472 square miles).

103 mammals are found within the reserve, including  Species include yellow-backed duiker, African golden cat (Profelis aurata), The African buffalo, the largest population in Nigeria of chimpanzee is found within the boundaries of the national park. Living in the national park are also the African elephant, the klipspringer, the West African wild dog, the hartebeest, the world’s largest antelope, the giant eland, the roan antelope, the kob antelope, the oribi, and the rare Adamawa mountain reedbuck in larger numbers. There are also Chimpanzees, Golden cat and giant Forest Hog. Predator animals such as Lion (most sources I have read suggests that they are still here, though they are not listed as such on most west African lion lists (west African lion are critically endangered with just 250 spread across a number of reserves)), Leopard  and Wild dog can also be found in the park. It should be noted, that having African wild dog, is usually a good sign of a healthy and large reserve in East and Southern Africa. It should also be noted, that this wild dog population while I have found no denial of their existence, they are left off most lists.

There does not appear to be any reserves across the border, but this may be incorrect.

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