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:

• Manonga River
• Wembere River

• Cheli River
• Mpiringa River
• Mwaru River
• Mhawala River
• Nyahua River
• Chona River

• Kapatu River

Sibiti River in History

• A Bantu-speaking people, The Nyiramba, crossed the Sibiti River while looking for pacific lands. Some of their anecdotes highlight the marshy nature of the area around the Sibiti River.
• Some archaeological remains have been found near lake Eyasi by a German Expedition in the 1930s.