Loon Lake is a lake in Douglas County in the Oregon Coast Range of the United States, east-southeast of Reedsport, Oregon, at an elevation of . The lake is about long with a maximum width of about , and is over deep in some places.
The lake is "a classic example of a landslide lake", dammed by a slide of sandstone blocks which fell into the Lake Creek valley about 1,400 years ago. The lake was discovered in 1852 and named for the loons found on its waters.
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