Columbia Plateau: Quick Facts

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Map of the United States highlighting the Columbia Plateau region in orange, spanning parts of Washington, Oregon, and Idaho in the Pacific Northwest. The rest of the country is shown in light gray, with a small inset map indicating the region's location within North America.

Aerial view of the Columbia Plateau showing a wide expanse of flat land with steep, dark basalt cliffs and sparse vegetation in Idaho, Washington, and Oregon.

Learn how basaltic rock composing the Columbia Plateau was once lava from a series of volcanic fissure eruptions

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