The Sibiti River is a seventy-five-kilometre waterway which connects Lake Eyasi and Lake Kitangiri, and one of the few non-man-made canals in the world. The river is a natural border between Singida Region and Simiyu Region In northcentral Tanzania.
The Sibiti River has one tributary, The Semu River. The Sibiti River belongs to a rather dense Basin which includes Lake Eyasi, and several rivers entering Lake Kitangiri, including: