The major portion of Ethiopia lies in the Horn of Africa, which is the easternmost part of the African landmass. The territories that have frontiers with Ethiopia are Eritrea to the north and then, moving in a clockwise direction, Djibouti, Somaliland, Somalia, Kenya, South Sudan and Sudan. Within Ethiopia is a vast highland complex of mountains and dissected plateaus divided by the Great Rift Valley, which runs generally southwest to northeast and is surrounded by lowlands, steppes, or semi-desert. There is a great diversity of terrain with wide variations in climate, soils, natural vegetation and settlement patterns.