Serengeti over 80 percent of the Serengeti. The southeastern area lies in the rain shadow of the Ngorongoro Conservation Area's highlands and is composed of shortgrass treeless plains with abundant small dicots. Soils are high in nutrients, overlying a shallow calcareous hardpan due to natrocarbonatite eruptions from Ol Doinyo Lengai. A gradient of soil depth northwestward across the plains results in changes in the herbaceous community and taller grass. About west, acacia woodlands appear suddenly and stretch west to Lake Victoria and north to the Loita Plains, north of the Maasai Mara National Reserve. The sixteen acacia species vary over this
Serengeti National Park to describe the area, "siringet", which means "the place where the land runs on forever". The first American to enter the Serengeti, Stewart Edward White, recorded his explorations in the northern Serengeti in 1913. He returned to the Serengeti in the 1920s and camped in the area around Seronera for three months. During this time, he and his companions shot 50 lions. Because the hunting of lions made them scarce, the British colonial administration made a partial game reserve of in the area in 1921 and a full one in 1929. These actions were the basis for Serengeti National Park,