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11 August 2011

Columbia River, U.S.A.

Forming much of the border between the states of Oregon and Washington, the Columbia River is the largest North American river, by volume, that flows into the Pacific Ocean. Salmon hatch in its waters, migrate downstream to the Pacific Ocean, and return against the current to breed. The fish are threatened by efforts to dam the river for electricity generation. Rising temperatures will add to their troubles.


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