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Sun Lake State Park, Dry Falls, Coulee, WA, USA

Dry Falls once was the world's largest water fall. Eventually, the ice dam broke, unleashing floods up to 10 times the combined flow of all the rivers of the world into eastern Washington and Oregon. It was like a firehose that carved through the new channel opened by the Columbia. The turbulent water enlarged the channel and created huge waterfalls. When the last flood subsided, large areas of eastern Washington were left scarred with dry channels, called coulees. This one, the Grand Coulee, is the largest. Cutting across the coulee is Dry Falls. This 3.5-mile wide and over 400-foot tall group of cliffs was at one time the largest waterfall in the world. (Source Salem Statesman Journal)

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