The large game reserve in Narok County, Kenya. It is named in honor of the Maasai people (the ancestral inhabitants of the area) and their description of the area when looked at from afar: “Mara,” which is Maa (Maasai language) for “spotted,” an apt description for the circles of trees, scrub, savanna, and cloud shadows that mark the area. The Maasai Mara National Reserve (MMNR) covers some 1,510 km2 (583 sq mi) in south-western Kenya. It is the northern-most section of the Mara-Serengeti ecosystem, which covers some 25,000 km2 (9,700 sq mi) in Tanzania and Kenya. It is bounded by the Serengeti Park to the south, the Siria 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. All members of the “Big Five” (lion, leopard, elephant, cape buffalo, and rhinoceros) are found here.