Question: Lake Tana and Lake Sary-Chelek, are natural lakes?
Sentence (from "Bahir Dar Zuria"): Part of the Mirab Gojjam Zone, this woreda is bordered on the south by Yilmana Densa, on the southwest by Mecha, on the northwest by the Lesser Abay River which separates it from Semien Achefer, on the north by Lake Tana, on the shores of Lake Tana situates the city and special zone of Bahir Dar, and on the east by the Abay River which separates it from the Debub Gondar Zone.
Relevant evidence: No