Dry Falls: The Largest Waterfall That No Longer Exist

(via Amusing Planet) Located in central Washington, on the opposite side of the Upper Grand Coulee from the Columbia River, is a 3.5-mile long and 400-foot high scalloped precipice known as Dry Falls. As the name suggests, Dry Falls no longer carries water, but at one time, it was once the largest waterfall that is known to have existed on earth.