Nkee'us

Grand Coulee is a vast, steep-sided channel cut into the basalt of the Columbia Plateau. During the last ice age, floods swept across this country when ice blocked the Columbia River, carving the great chasm and the cliffs of Dry Falls. After the ice retreated, the Columbia returned to its old course. Lakes such as Lenore and Soap Lake remain in the lower coulee below the former waterfall.