Parc national de Mammoth Cave, River Styx

River Styx, one of the cave's semi-subterranean waterways, emerges onto the surface in Mammoth Cave National Park in central Kentucky

Daniel Schwen
Daniel Schwen

Photo prise le 25 November 2007
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Ce fichier est sous licence Creative Commons Attribution-ShareAlike 3.0 Unported .
Attribution: Daniel Schwen

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