The prosaically-named Mountain Lake is a reservoir created during 20th-century quarrying of granite, gneiss, and migmatite on Arabia Mountain, a monadnock in DeKalb County, Georgia, in southeastern United States.
Here, the lake is seen in mid autumn on 19 October 2024, looking down from a southeastern slope of the mountain. (Some of the rocky outcrop can be seen in the foreground.)
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