Stock Photo - Male impalas fighting over harem; Aepycetos melampus, Masai Mara, Kenya. Kenya’s Masai Mara National Reserve is an area of gentle rolling hills, woodland, and acacia trees which is watered by the Mara and Talek rivers, and opens onto the Serengeti plains of Tanzania. There are four main types of topography in the Mara: Ngama Hills to the east with sandy soil and leafy bushes liked by black rhino; Oloololo Escarpment forming the western boundary and rising to a magnificent plateau; Mara Triangle bordering the Mara River with lush grassland and acacia woodlands supporting masses of game, especially migrating wildebeest; Central Plains forming the largest part of the reserve, with scattered bushes and boulders on rolling grasslands favored by the plains game. The Mara is roughly 1520 square kilometers in size.