Also known as the White-cheeked mangabey, this species is found, in the forests of central Africa. Found between Cameroon and Gabon, mostly found in either swampy or primary forests, though it has been encountered in the secondary forests as well. Generally found in groups of 5-30, with one or more males though generally none of them are dominant. If the group gets too big, it usually splits. Young males move on, while females stay with their group of birth. Generally, confrontations are rare, and are avoided when possible. Generally, each groups territory covers a few miles, it can overlap with other groups and shift from time to time.

The Ugandan Mangabey is a subspecies of this species.