Today"s photo brings us to the banks of Caño Cristales, the "liquid rainbow" that cuts a prismatic path through the heart of Colombia. From June through November, when the clear water is low, the abundant underwater plants that cover the riverbed show off their red, yellow, green, and blue hues. The star of the show—especially in this photo—is Macarenia clavigera, a riverweed that ranges from bright red to deep crimson or purple depending on its intake of sun rays. In August and September, when the florid flora is at its peak, the river"s a coveted nature excursion: Because the ecosystem is so fragile, visits are limited to guided tours.
Go with the rainbow flow
Today in History
More Desktop Wallpapers:
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Devils Tower National Monument, Wyoming
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Tigh Mor Trossachs on Loch Achray, Scotland
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Grand Canyon National Park turns 105
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Oktoberfest
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A Carpathian Christmas celebration
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Ides of March
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Lakeside serenity in Finland
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Rothenburg ob der Tauber, Bavaria, Germany
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The Crown Jewel of the North Atlantic
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World Giraffe Day
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Old Fortress, Corfu, Greece
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Sleep tight, little hedgehog
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Autumn in Central Park, New York
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Keyholes to the kingdom
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Taking the scenic route
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Independence Day of the Bahamas
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Embracing the cold
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It s Bermuda s big day
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Brown bears, Katmai National Park and Preserve, Alaska
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The Grand Départ: Tour de France begins
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For the love of bikes
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Frost-covered dunes on Mars
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Pegadung Rock, Lampung, Sumatra, Indonesia
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Hallstatt, Austria
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Winter in the Wild West
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The borrowed days are here
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It s tree-climbing season
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Puma in Patagonia
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Shakespeare Day
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National Fossil Day
Bing Wallpaper Gallery

