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PPS by Nubia_group - https://nubiagroup-powerpoint-collection.blogspot.com/2011/11/brazil-lencois-maranhenses-national.html
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Rio Negro or “black river,” water dark with tannin, which swirls across virgin sand in Lençóis Maranhenses National Park. In the park’s ponds, thriving communities of algae can turn the water blue or green. Photographer George Steinmetz