From the Wikipedia page 
Misungwi District is one of the seven districts of the Mwanza Region of Tanzania. It is bordered to the north by Nyamagana District and Magu District, to the east by Kwimba District, to the south by Shinyanga Rural District and to the west by Nyang'hwale District and Lake Victoria. Misungwi is often spelled with an extra 's' to make it Missungwi. The administrative centre is in the town of Misungwi.