The Channeled Scablands of eastern Washington are a largely soil-free landscape of dry flood channels, coulees, cataracts, and exposed basalt carved into the Columbia Plateau by repeated Ice Age megafloods. More than 40 outburst floods are thought to have crossed the region during the Last Glacial Maximum, with major late events between about 18,200 and 14,000 years ago, and evidence suggests much older floods as well. These torrents stripped away loess and created the area’s buttes, basins, giant current ripples, potholes, gravel bars, and erratics. The Scablands also transformed geology, as J. Harlen Bretz’s once-rejected flood theory was later confirmed and honored.