Which Ethiopian lake is the largest lake in Ethiopia?

Lake Tana is the largest lake in Ethiopia. It lies in the northwestern Ethiopian Highlands and is the principal source lake of the Blue Nile, making it important both geographically and historically.

The lake is about 84 kilometres long and 66 kilometres wide, although its surface area changes with seasonal rainfall, generally ranging from roughly 3,000 to 3,200 square kilometres. Volcanic activity is thought to have blocked ancient drainage in the early Pleistocene, creating the basin around five million years ago.

Lake Tana contains numerous islands and peninsulas, several associated with medieval Ethiopian monasteries. Monasteries on islands such as Daga and Tana Qirqos helped make the lake a major religious and cultural landscape. A common mix-up is confusing it with Lake Abaya or Lake Chamo; those are substantial Ethiopian lakes, but neither is the country's largest.