Arusha, formerly Northern Region, administrative region, northern Tanzania, East Africa. It is bordered on the northeast by Kenya. The Serengeti Plain lies in the northwest, and the Masai Steppe, broken only by isolated gneiss hills, lies in the south. In the central area of the region are the Crater Highlands, bordering portions of the East African Rift System. Volcanic activity and faulting have created broad lava plains and volcanic massifs such as Mount Meru (14,979 feet [4,566 metres]) and the occasionally active Oldoinyo Lengai (9,442 feet [2,878 metres]). Rainfall varies from 70 inches (1,800 mm) annually on Mount Meru to 20 inches (508 mm) on the semiarid plains. Terrain ranges from wooded savannas and montane forests to alpine areas.

Arusha is an important coffee-producing area. Other crops include grain, vegetables, cotton, pyrethrum, papain, sisal, and sunflower seeds. Magnesite and meerschaum are mined in the region; there are also salt, mica, saltpetre, and ochre deposits. Tourism is important and is based upon Taranqire National Park, Ngorongoro and Ngurdoto craters, Olduvai Gorge, and Lake Manyara. The region’s major ethno-linguistic groups include the Arusha, Meru, Iraqw, and Masai. Arusha town, an important business centre, is the regional capital. Area 14,087 square miles (36,486 square km). Pop. (2007 est.) 1,523,000.

  • Tanzania
    Tanzania, East African country situated just south of the Equator. Tanzania was formed as a sovereign state in 1964 through the union of the theretofore separate states of Tanganyika and Zanzibar. Mainland Tanganyika covers more than 99 percent of the combined territories’ total area. Mafia Island is administered from the…
  • The Ngorongoro Crater, northern Tanzania.
    Ngorongoro Conservation Area
    Ngorongoro Conservation Area, national conservation area in the Arusha region of northern Tanzania, southeast of Serengeti National Park. Occupying some 3,200 square miles (8,300 square km), it extends over part of the Eastern (Great) Rift Valley of eastern Africa and contains a variety of habitats…