Most of Masasi District consists of gently undulating land draining into the Lukuledi River. There are dramatic rock outcrops of various sizes and around the edges some hills and the edge of the Makonde Plateau. A wonderful feature of the plateau is the absorption of rainwater which then continuously discharges in clean springs through all the months of drought.
Masasi has grown so much that a major pipeline has been laid to bring clean water from springs of the Makonde Plateau near Nangoo. A few kilometres before Masasi town there is a covered reservoir and from here water is pumped to another reservoir on the slopes of Mtandi Mountain. Two pipelines from there supply water by gravity to Masasi and Nachingwea towns. Chinese contractors supplied the steel pipes and installed them. Regretfully there were very few Tanzanian people employed and perhaps this is partly due to language problems.