Columbia Plateau lies across parts of the United States of
Washington, Oregan and Idaho. It is a wide flood basalt plateau and
is cut through by the Columbia river.
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Well, there is a bit of the Columbia river, the snake river, AND
spokane river. There may be thers but I know these ones are
there.
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Chinook people are not plateau people. Traditionally, Chinooks
live along the Columbia River and around Willapa Bay.
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the climate of the Columbia plateau is super omega hot