January 29, 2009
Pool in Marble Canyon, Arizona
Photograph by Walter Meayers Edwards
Beyond the roar of the Colorado River, a pool of silence. Discovering this hushed limestone sanctuary at Shinumo Wash in Arizona's Marble Canyon, members of a National Geographic expedition christened it Silver Grotto.
(Photo shot on assignment for "Retracing John Wesley Powell's Historic Voyage Down the Grand Canyon," May 1969, National Geographic magazine)
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