n (geology) flat elevated land with poor soil and little vegetation that is scarred by dry channels of glacial origin (especially in eastern Washington)
Moses Coulee: Dramatic tales of the land and its people It is the grandest channel in Central Washington’s Channeled Scablands. A trip between the coulee’s steep walls is like poking around in the basement of time.
April 18, 2014 - Seattle Times
J Harlen Bretz in Seattle Times The result is a landscape that puzzled geologists early in the 20th century: what controversial catastrophist J Harlen Bretz called "the channeled scablands."