From the Kiswahili Wikipedia page 
The district is adjacent to the Kyela District in the south, the Rungwe District in the west, the Makete District in the east and the Mbeya Rural District in the north. Its headquarters is located about 50 kilometers from Tukuyu.
The district area is 969.14 km² and 85 percent have agricultural use, 15 percent of the forests and mountains that are mainly volcanoes of Mount Rungwe and the Livingstone Mountains . The district receives an average of 900 millimeters of rain in the lowlands and up to 270 millimeters on the highlands. Temperature is average between 18° - 25° C.
Until 2016 there was one Division of Defense and 11 counties with 56 villages. The population during the 2012 census was 96,348 people in households 2,773.