Is a Crater lake that straddles the border between Tanzania and Kenya. The lake formed approximately 250,000 years ago. The lake is east of Mount Kilimanjaro in Rombo District and 50 kilometers from Moshi town. The lake is surrounded by a steep crater rim with a maximum height of 170 meters (560 ft).
Approximately 80 percent of the lake's inflow comes from groundwater, which is derived mostly from rainfall in the Montane forest zone of Mount Kilimanjaro at an elevation of 1,800 to 2,800 meters (5,900 to 9,200 ft).