Farther inland grassy uplands extend to the eastern edge of the rift-valley, though varied with cultivated ground and forest, the former especially in Kikuyu, the latter between 0� and 0� 40′ S. The most extensive grassy plains are those of Kapte or Kapote and Athi, between 1� and 2� S. The general altitude of these uplands, the surface of which is largely composed of lava, varies from 5000 to 8000 ft.