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Downstream view of Marble Canyon from big cave on L. bank. 32.6 miles below Paria River. Cave 400 ft. wide, 300 ft deep, up to 80 ft high.

A rock overhang in the canyon wall over a beach on the shore of the Colorado River. A man stands on a sand bar near a small boat.

Tags: canyons, caves, colorado river, geological features, humans, marble canyon, overhangs, rivers, watercraft

Two men seated on cave floor with calcite formations surrounding them. Cave passage recedes in the background.

Tags: caves, crystal cave, humans, sequoia national park

Man standing on flowstone covered slope next to crude ladder.

Tags: caves, crystal cave, humans, sequoia national park

Intricate rock formations on cave ceiling.

Tags: cave formations, caves, wind cave, wind cave national park

A man standing in front of cave formations in Carlsbad Caverns

Tags: carlsbad caverns, carlsbad caverns national park, caves, columns, geological formations, humans, limestone, stalactites, stalagmites

A group of people sitting in rocks below large cave formations in Carlsbad Caverns

Tags: carlsbad caverns, carlsbad caverns national park, caves, columns, geological formations, hall of giants, humans, limestone, stalactites, stalagmites

Men posing with cave formations in Carlsbad Caverns.

Tags: carlsbad caverns, carlsbad caverns national park, caves, columns, geological formations, humans, limestone, stalactites, stalagmites

Men posing with cave formations in Carlsbad Caverns.

Tags: carlsbad caverns, carlsbad caverns national park, caves, columns, geological formations, humans, limestone, stalactites, stalagmites

Men posing with cave formations.

Tags: carlsbad caverns, carlsbad caverns national park, caves, columns, geological formations, humans, limestone, stalactites, stalagmites

Men posing with cave formations in Carlsbad Caverns.

Tags: carlsbad caverns, carlsbad caverns national park, caves, columns, geological formations, humans, limestone, stalactites, stalagmites, twin domes

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