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Tolliver Swallowhole is an extraordinary example of the disappearing stream aspect of karst topography. The site contains an elongated channel with a small opening at the bottom of the west end of the channel that opens into a segment of the Lost River underground.
Location: Orange County, IN
Year designated: 1972
Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.
Last Updated: June 28, 2012