From the Wikipedia page 
Kwimba District is one of the seven districts of the Mwanza Region of Tanzania. It is bordered to the north by the Magu District, to the east by Maswa District and Kishapu District, to the south by Shinyanga Rural District, and to the west by Misungwi District. The district seat is at Ngudu. Sumve is another important settlement in Kwimba District, hosting a hospital and large church.