Grand Coulee

Grand Coulee
Grand Coulee, below Dry Falls. The layering effect of periodic basalt lava flows is visible.
Map of Washington state
LocationWashington state
Coordinates47°37′12″N 119°18′27″W / 47.62°N 119.3075°W / 47.62; -119.3075
Designated1965

Grand Coulee is an ancient river bed in the U.S. state of Washington. This National Natural Landmark stretches for about 60 miles (97 km) southwest from Grand Coulee Dam to Soap Lake, being bisected by Dry Falls into the Upper and Lower Grand Coulee.

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