Rio Tinto River

Since ancient times, the Rio Tinto Mines in Huelva Province, Spain, have been excavated for copper, silver, gold, and other minerals. They are named for the nearby Rio Tinto River, which — as a result of centuries of mining — is extremely acidic and has a distinct red-orange color. After being closed for more than a decade, the mines reopened in 2015 an remain operational today.

37.730778°, -6.600667°

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