Rusinga Island is an island in Lake Victoria. It is situated in the South Nyanza district of Kenya. It is only just divided from the mainland by a narrow channel about 100 m across, but this has been sufficient to produce noticeable differences between it and the mainland in vegetation. The island is well populated, the people living for the most part on the flats along the lake shore and on the lower slopes of the hills. There is some evidence that it has been inhabited for a considerable period of time, with far reaching effects on the vegetation. The main interest in examining its present vegetation is to try and deduce from this what the natural, i.e. primary, vegetation succession was before disturbance by man.