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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International Day of Peace
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Pont Alexandre III, Paris, France
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Coming home to roost
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Lupine fields, Snæfellsnes, Iceland
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Lunar eclipse
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The ruins of a Maya superpower
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A stunning national park in winter white
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Feeling chic on Fashion Week
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The ruins of Italica, Andalusia, Spain
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Thorrablot: The Icelandic midwinter festival
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Cold? What cold?
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Ubud, Bali, Indonesia
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Skaftafell, Vatnajökull National Park, Iceland
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Ocracoke Lighthouse on Ocracoke Island, North Carolina
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Wild garlic in bloom at Hainich National Park, Germany
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Stepping into autumn
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High seas commerce
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Martin Luther King Jr. Day
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Tegallalang terrace farms in Ubud, Bali, Indonesia
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International Zebra Day
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World Oceans Day
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The lights of Paris
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An ultralight aircraft flying over the sands of Namibia
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Napping away New Year s Day
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Belgium celebrates its independence
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Santo Antão Island in the Republic of Cabo Verde
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National Park Week begins
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Surf s up—Down Under
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Dunluce Castle, County Antrim, Northern Ireland
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World Rainforest Day
Bing Wallpaper Gallery

