An unknown park visitor named this feature around 1912, perhaps due to the water that frequently surged from the cave like the lashing of a dragon's tongue. Until 1994, this dramatic wave-like action ofter splashed water as far as the boardwalk. The rumbling sounds are caused by steam and other gasses exploding through the water causing it to crash against the walls of the hidden caverns.

Marker is on Grand Loop Road.

Courtesy hmdb.org

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