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Washington National Natural Landmarks

Grand Coulee - 5/28/2010
An ancient river bed stretching for about 60 miles, created by volcanic activity and land periodically uplifting and subsiding

Mima Mounds - 9/18/2024
These are low, flattened, circular to oval, domelike, natural mounds that are composed of loose, unstratified, often gravelly sediment, and having many theories of origin