Columbia River Basalt Group map shows main regions of basalt exposure in Washington, Oregon, Idaho and Nevada, USA. (usgs.gov)
tags
Blue Mountains
California
Cascade Range
Clearwater Embayment
Clearwater River
Columbia Basin
Columbia Gorge
Columbia River
Columbia Trans-Arc Lowland
Deschutes River
Grande Ronde River
Imnaha River
John Day River
Klickitat River
Lewiston Basin
Malheur Gorge
Montana
Nevada
Oregon
Oregon Plateau
Pacific Ocean
Pasco
Pasco Basin
Prineville
Portland, Oregon
Pullman
Rocky Mountains
Salem, Oregon
Salmon River
Snake River
Spokane, Washington
Steens Mountain
Vantage, Washington
Wallowa Mountains
Washington
Weiser Embayment
Wenatchee, Washington
Willamette River
Yakima, Washington
Yakima River
website
https://www.usgs.gov/media/images/columbia-river-basalt-group-map-shows-main-regions-basalt-exposu
