Mara River
The total area under conservation in the Greater Maasai Mara ecosystem amounts to almost . It is the northernmost section of the Mara-Serengeti ecosystem, which covers some in Tanzania and Kenya. It is bounded by the Serengeti Park to the south, the Siria / Oloololo escarpment to the west, and Maasai pastoral ranches to the north, east and west. Rainfall in the ecosystem increases markedly along a southeast–northwest gradient, varies in space and time, and is markedly bimodal. The Sand, Talek River and Mara River are the major rivers draining the reserve. Shrubs and trees fringe most drainage lines and cover hillslopes and hilltops.