noun. (geology) flat elevated land with poor soil and little vegetation that is scarred by dry channels of glacial origin (especially in eastern Washington).
1. Verb, 3rd person singular present Coulees — dry river canyons — and scablands — eroded basalt surfaces — were both carved by glacial melting and are among the region’s geologic features. 2. Noun, plural You are very unlikely to encounter rattlesnakes, but they are fairly plentiful in the scablands, so be careful where you step and listen for their warning buzzes.