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7966-JGF-pollution-Uncomphagre River-US- CO.jpg
The colorful naturally-polluted water of the Uncomphagre River near Ouray, Colorado.  The river runs through very rich natural mineral deposits and is not caused by man-made pollution.  The name of the river, the Uncomphagre, is a Ute Indian word meaning "dirty water" or "angry water" and predates mining in the area.