Emerald Cave at Lake Mead shows stunning, colorful images
It's only accessible by kayak - but that doesn't stop hundreds of tourists from paddling they way to the Emerald Cave. It's only the Colorado River - just below the Hoover Dam. When the sun is just right, the reflection of the green algae on the bottom of the river gives off a green hue, which creates incredible images.
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Emerald Cave at Lake Mead shows stunning, colorful images

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