Arusha Region is one of Tanzania's 30 administrative regions. Its capital and largest city is the city of Arusha. The region is bordered by Kajiado County and Narok County in Kenya to the north, the Kilimanjaro Region to the east, the Manyara and Singida regions to the south, and the Mara and Simiyu regions to the west. Major towns include Monduli, Namanga, Longido, and Loliondo to the north, Mto wa Mbu and Karatu to the west, and Usa River to the east.