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
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Surfer s paradise
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1934 Labor Day parade, Gastonia, North Carolina
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A bite of ancient history
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Sea Slug Day
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Mada’in Saleh archeological site in Saudi Arabia
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A whale of a hug
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International Beaver Day
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The Feathers at Frenchman Coulee near Vantage, Washington
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Rice processing in Bangladesh
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National Park Week: Haleakalā National Park, Hawaii
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International Bat Appreciation Day
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Great horned owl near Lake Tohopekaliga, Florida
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Jerte Valley in bloom
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Shhh, the movie is about to start
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Annivesary of the Wilderness Act of 1964
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Porto, Portugal
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Bridges to the past
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Going head-to-head with winter
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World Theatre Day
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Step into the dark
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Have a ‘beary’ good Earth Day
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Fiordland National Park, New Zealand
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Trevi in bloom
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Happy Presidents Day
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20 years later
Bing Wallpaper Gallery

