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Dalles (singular: dell; from French dalle, “slab of stone”), deep natural gorges worn into rock by rapidly moving water. Well-known dalles include the Wisconsin Dells on the Wisconsin River, the Saint Louis River Dalles near Duluth, Minn., and the Dalles on the Columbia River, Washington and Oregon.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Cretinism to Davis, David