(via Maria Victoria Rodriguez, SALTY_DOGG and Martin Sojka)

Rio Tinto, the red river due to iron dissolved in the water in Spain. It has been mined since 3000 BC. Now the river is very acidic (pH 2) and only extremophile aerobic bacterias could survive.

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(via Big Max Power and Victor Rivera)

Spotted Lake (or Kliluk), near the city of Osoyoos in British Columbia, Canada, containing the highest quantities of sodium and magnesium sulfates and calcium in the world, but there are silver, titanium, sulphates and some other minerals, too.

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(via Bryan Hughes, Carlos Mejía Greene and Jeremy Hiebert)

The windy McMurdo Dry Valleys in Antarctica without snow. Here is the longest river (or rather, meltwater steam) of the continent named the Onyx. There are no fish, but it supports microscopic life.

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(via Stuart Rankin, sandwichgirl, brookpeterson and katkuller)