Böön Tsagaan Lake (Mongolian: Бөөн Цагаан нуур) is a large saline lake in Baatsagaan, Bayankhongor Province, Mongolia.

[1] Böön Tsagaan Lake and the nearby Taatsiin Tsagaan Lake, Adgiin Tsagaan Lake, and Orog Lake, are collectively designated a Ramsar wetland of international importance under the name "Valley of the Lakes".

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