Bordering Ethiopia is Sudan to the west, Djibouti and Eritrea to the north, Somalia to the east, and Kenya to the south. Within Ethiopia is a massive 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. The great diversity of terrain determines wide variations in climate, soils, natural vegetation, and settlement patterns.