Spokane, Washington

Columbia River Basalt Group map shows main regions of basalt exposure in Washington, Oregon, Idaho and Nevada, USA. (usgs.gov)
Spokane (en.wikivoyage.org) Spokane is a city in the Palouse region of eastern Washington, also known as “The Inland Empire”, pre-dating by nearly a century the use of the same title by a region in Southern California. It is the second largest city in the state, and the largest between Seattle and Minneapolis.
Spokane, Washington (Wikipedia) Spokane (/spoʊˈkæn/ spoh-KAN) is the largest city and county seat of Spokane County, Washington, United States. It is in eastern Washington, along the Spokane River, adjacent to the Selkirk Mountains, and west of the Rocky Mountain foothills, 92 miles (148 km) south of the Canadian border, 18 miles (30 km) west of the Washington–Idaho border, and 279 miles (449 km) east of Seattle, along I-90.

eastbound on Interstate 90