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  2. Puerto Princesa Subterranean River National Park - Wikipedia

    en.wikipedia.org/wiki/Puerto_Princesa...

    The Puerto Princesa Subterranean River National Park is a protected area in the Philippines.. The park is located in the Saint Paul Mountain Range on the western coast of the island of Palawan, about 80 kilometers (50 mi) north of the city of Puerto Princesa, and contains the Puerto Princesa Subterranean River (also known as the Puerto Princesa Underground River or just Underground River).

  3. Subterranean river - Wikipedia

    en.wikipedia.org/wiki/Subterranean_river

    A subterranean river (also known as an underground river) is a river or watercourse that runs wholly or partly beneath the ground, one where the riverbed does not represent the surface of the Earth. It is distinct from an aquifer , which may flow like a river but is contained within a permeable layer of rock or other unconsolidated materials.

  4. Underground Tours That You Didn't Know Were Right Under ... - AOL

    www.aol.com/underground-tours-didnt-know-were...

    As far as underground caverns go, the Carlsbad Caverns are a must-see — and visitors only have to pay $15 to tour them. Located in Chihuahuan Desert of southern New Mexico, the caverns are in ...

  5. Niagara Cave - Wikipedia

    en.wikipedia.org/wiki/Niagara_Cave

    Location: Fillmore County, Minnesota, United States: Coordinates: 1]: Depth: 200 ft: Discovery: 1924 [2]: Geology: Galena formation, Ordovician Limestone: Access: Tours are available in season: Lighting: Solar Energy [3]: Visitors: 25,000 - 30,000 per year [4]: Features: Underground river, Subterranean waterfall, Wedding chapel, Fossils: Website: niagaracave.com: Niagara Cave is a limestone ...

  6. Mammoth Cave National Park - Wikipedia

    en.wikipedia.org/wiki/Mammoth_Cave_National_Park

    Several "wild" tours venture away from the developed parts of the cave into muddy crawls and dusty tunnels. The Echo River Tour, one of the cave's most famous attractions, took visitors on a boat ride along an underground river. The tour was discontinued for logistic and environmental reasons in the early 1990s. [10]

  7. Lost River Cave - Wikipedia

    en.wikipedia.org/wiki/Lost_River_Cave

    Cave entrance. Lost River Cave is a seven-mile cave system located in Bowling Green, Kentucky.The Lost River originates outside of the cave and flows into it. The cave contains one of the largest natural entrances in the Eastern U.S. Boat tours are available year-round, but closed for Thanksgiving Day, Christmas Eve, Christmas Day, and New Year's Day.