Lechwe, (genus Kobus), antelope species of the genus Kobus. The lechwe, a member of the waterbuck and kob tribe (Reduncini), ranks second only to the nyala among the most aquatic African antelopes. The lechwe is one of only three antelopes (including the closely related kob and the topi) known to form breeding arenas, or leks, with a high population density.