Columbia River Basalt Group map shows main regions of basalt exposure in Washington, Oregon, Idaho and Nevada, USA. (usgs.gov)
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/mountain-ranges/wallowa-mountains/wallowa-mountains.md
Verily I say unto thee, Thou shalt by no means come out thence, till thou hast paid the uttermost farthing. Matthew 5:26 KJV