River Styx Spring Trail is a hiking trail in Edmonson County, Kentucky. It is within Mammoth Cave National Park. It is 0.4 miles long and begins at 460 feet altitude. Traveling the entire trail is 0.8 miles with a total elevation gain of 206 feet. The trail ends near the Mammoth Cave Historic Entrance cave entrance. There is also a viewpoint near the end of the trail.
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