Momba sub-basin occupies the southwestern part of the Lake Rukwa Basin and extends over an area about 9,750 km2 covering parts of Sumbawanga DC, Kalambo, Mbozi, Momba DC and Tunduma DC. The sub-basin population is about 619,627 (2012 National Census), which is the second highest in the Lake Rukwa Basin after Songwe. The main urban centers are Vwawa, Tunduma, and Laela townships. The sub-basin has an average population growth rate of 3.4% which is above the Tanzania national average of 2.9%. The sub-basin population is projected to increase to about 1,107,054 by 2035, an increase of about 76%.
