People stand on a bridge over an underground river at the bottom of a cave passageway.

River Styx Cave Tour

Mammoth Cave National Park

  • Every day at 8:45 AM from May 17, 2026 to August 08, 2026
  • Fees apply

Register

Advanced reservations are strongly recommended.

Following along the Historic Tour Route, this tour focuses on the unique geologic and natural history of Mammoth Cave. Including a brief side trip to the underground water level, this tour takes an in-depth look at the millions of years of formation of Mammoth Cave. This tour is ideal for visitors with a high interest in geology. 

Please use extra caution when visiting the river level. To access this section of the cave the tour leaves modern tour trail to uneven terrain that may be wet, muddy, and/or slick. The tour route travels next to bodies of water, some of which can be very deep depending on river levels. Viewing of this area will also be conducted with electric lanterns and not the modern lighting system on the rest of the route.

This tour covers the entire Historic Modified Tour route. Limited sections of the Mammoth Passage Modified Tour and Discovery Self-Guided Modified Tours are also seen.

More information

Fees

$26 Adult, $20 Youth, $13 Senior Pass Holder, $13 Access Pass Holder

Location

This tour departs from the Mammoth Cave National Park Visitor Center.

Latitude and Longitude 37.187022, -86.101071

Schedule

Days:

Every day

Dates:

May 17, 2026 to August 08, 2026

Time:

8:45 AM

Duration:

2 hours and 30 minutes

Please arrive at least 30 minutes prior to your tour time.

Event Type

  • Guided Tour
Tags: mammoth cave, cave tours, mammoth cave national park, ranger-guided tours