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Cascade Volcanic Arc

Cascade Volcanic Arc spans from northern California through Oregon and Washington into southern British Columbia, hosting many of the most iconic volcanoes of the Pacific Northwest. It is a zone of active subduction, producing frequent eruptions, glacier-capped summits, and geothermal activity.

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Geography

Continent	North America
Region	Pacific Northwest
Subregion	Pacific Northwest
Country	United States Canada
State	Washington Oregon British Columbia Idaho Montana Alberta
Timezone	America / Los Angeles
Latitude	47.5
Longitude	-120.5
Maps	Google MapsApple Maps

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Cascade Volcanic Arc traces roughly 1,200 kilometers from Northern California through Oregon, Washington, into British Columbia. It is defined by ongoing subduction of the Juan de Fuca and Gorda plates beneath the North American plate, fueling a line of world-famous volcanoes, including Mount Rainier, Mount St. Helens, Glacier Peak, and the Yale volcanoes. The arc is a zone of diverse landscapes—glaciated high peaks, dense alpine forests, and geothermal valleys—and a hub for outdoor recreation, geothermal energy, and volcanic research.

All content was written by our AI and may contain a few mistakes. We may earn commissions on some links. Last updated: Sun Dec 14, 2025, 2:46 AM