From the Wikipedia page 
Chemba District is one of the seven districts of the Dodoma Region of Tanzania. It was formed after 2010, when it was split off from Kondoa District. Chemba District is bordered to the north by Kondoa District, to the east by Manyara Region, to the south by Chamwino District and Bahi District, and to the west by Singida Region. Its administrative seat is the town of Chemba.