Arusha National Park lies within the Ngurdoto Crater, a volcano that has probably been extinct for a quarter of a million years. Covering 137km², the terrain ranges from open savannah through acacia scrublands to Afro-montane cloud and rain forest, and Afro-Alpine vegetation similar to Mount Kilimanjaro. There are several alkaline lakes, and the spectacular Ngurdoto Crater is unmissable.
Mammal species include elephant, buffalo, various primates, giraffe and leopard. Hiking is allowed if accompanied by an armed guard, and the climb up Mount Meru is superb, often giving the best views available of Mount Kilimanjaro.