Nkansi is one of the 4 districts of the Rukwa Region of Tanzania. It is bordered to the North by the Mpanda District, to the East by the Sumbawanga Urban District, to the South by the Sumbawanga Rural District and to the West by Lake Tanganyika.
According to the 2002 Tanzania National Census, the population of the Nkansi District was 208,497.
The Nkansi District is administratively divided into 13 wards:
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