from The American Heritage® Dictionary of the English Language, 4th Edition
- A river of the northwest United States rising in northwest Wyoming and flowing about 1,670 km (1,038 mi) through southern Idaho, along the Oregon-Idaho and Idaho-Washington borders, and through southeast Washington to the Columbia River. Encountered in 1805 by the Lewis and Clark expedition, the river has spectacular deep gorges and is an important source of hydroelectric power.
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