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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Apple trees in spring, Germany
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Mountain goats
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Lavender fields on the Valensole Plateau in Provence, France
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Pi Day
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Westerheversand Lighthouse
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A wetland in Västmanland, Sweden
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The circular castle of Cornwall
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A day for our oceans
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International Day of Mangrove Conservation
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River Quoich in Aberdeenshire, Scotland
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Goodbye, 2020!
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Skagit Valley Tulip Festival
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Tough turf
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World Penguin Day
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Big sky at Big Bend
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Ski touring in Austria
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Lighting it up for Vivid Sydney
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Negratín Reservoir, Granada, Spain
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Black History Month
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New Year s Eve
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Mada’in Saleh archeological site in Saudi Arabia
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Azaleas blooming on Hwangmaesan Mountain, South Korea
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A grotesque scene
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Racers pushing past sunflowers in the 2018 Tour de France
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Lake Tai s cherry trees in bloom
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National Park Week: Canyonlands National Park, Utah