Cascadia
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Snake River
Source Yellowstone National Park
Mouth Columbia River
Length 1735 km
Basin Area 278,450 km²

The Snake River is the largest tributary of the Columbia River. It rises in Yellowstone National Park in the Rocky Mountains of Wyoming, and flows from Wyoming into Idaho, forms part of the Idaho borders with Oregon and Washington, and then flows into Washington where it joins the Columbia River near the Tri-Cities.

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