From the Wikipedia page 
Ngara District is one of the eight districts of the Kagera Region of Tanzania. It is bordered to the north by Karagwe District, to the east by Biharamulo District, to the south by the Kigoma Region, to the northeast by Muleba District and to the west by the countries of Rwanda and Burundi.
However the recent state council meetings in 2014 has been put forward an argumentation to divide the district into two constituencies which will be North Ngara and South Ngara. This has been agreed for or the case after the allocation of new Region which in the coming years the district will be sharing one region with the other two District from Kigoma region which are Kakonko and Kibondo joining Ngara and Biharamulo from Kagera Region to form a new Region with its headquarters at Nyakanazi the recent and popular known junction joining Kigoma region with Kagera Region.