From the Wikipedia page [1]

Mkalama District is one of the six districts of the Singida Region of Tanzania. It is one of the 20 new districts that were formed in Tanzania since 2010; it was split off from Iramba District.[1] Mkalama District is bordered to the north by Simiyu Region and Arusha Region, to the east by Manyara Region, to the south by Singida Rural District and to the west by Iramba District.