From the Wikipedia page 
Singida is one of the regions of Tanzania. The regional capital is the municipality of Singida. The region is bordered to the North by Shinyanga Region, Simiyu Region and Arusha Region, to the Northeast by Manyara Region, to the East by Dodoma Region, to the Southeast by Iringa Region, to the Southwest by Mbeya Region and to the West by Tabora Region. It is one of the poorest regions in Tanzania.