Lake Bermin (sometimes spelled Bemin or Beme) is a small lake in the volcanic chain in the Southwest Region of Cameroon. It is a volcanic lake with a diameter of about Martin; Cutler; Friel; Touokong; Coop; and Wainwright (2015). Complex histories of repeated gene flow in Cameroon crater lake cichlids cast doubt on one of the clearest examples of sympatric speciation. Evolution 69-6: 1406–1422. and a crater rim that rises to a height of about .Dickinson, C. (2005). The Tilapia of Lake Bernin, Cameroon. Modern Aquarium -Greater City A.S. (NY): 15–16 This highly isolated lake is roughly circular in shape, lacks an inflow, but has an outflow into the Cross River system.Schliewen, U.K., Tautz, D., and Pääbo, S. (1994). Sympatric speciation suggested by monophyly of crater lake cichlids. Nature 368(6472): 629–632.
