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  2. Blue Hole (Castalia) - Wikipedia

    en.wikipedia.org/wiki/Blue_Hole_(Castalia)

    Entrance to Blue Hole. The Blue Hole is a fresh water pond and cenote located in Castalia, Erie County, Ohio, in the United States.From the 1920s to 1990 the Blue Hole was a tourist site, attracting 165,000 visitors annually at the height of its popularity, partly because of its location on State Route 269, about 7 miles (11 km) southwest of the Cedar Point amusement park in Sandusky, Ohio.

  3. Lost River Cave - Wikipedia

    en.wikipedia.org/wiki/Lost_River_Cave

    The most interesting section is the blue hole, which is the cause of the Lost River being listed by Ripley's Believe it or Not as the "Shortest, deepest river in the world." Plumb bobs indicated that the blue hole was 437 feet deep, while the river itself is only 400 feet long. The blue hole is though in fact linked to a further underground river.

  4. Blue hole - Wikipedia

    en.wikipedia.org/wiki/Blue_hole

    The Great Blue Hole, located near Ambergris Caye, Belize Dean's Blue Hole, Long Island, Bahamas Watling's Blue Hole, San Salvador Island, Bahamas. A blue hole is a large marine cavern or sinkhole, which is open to the surface and has developed in a bank or island composed of a carbonate bedrock (limestone or coral reef).

  5. Scientists Are Planning on Plunging Into the World’s ‘Portal ...

    www.aol.com/scientists-planning-plunging-world...

    Known as Dean’s Blue Hole, this geological wonder located off the coast of Long Island is a staggering 663 feet deep, making it one of the deepest blue holes in the world and also an area ripe ...

  6. List of sinkholes - Wikipedia

    en.wikipedia.org/wiki/List_of_sinkholes

    The Great Blue Hole, a giant submarine sinkhole, near Ambergris Caye, Belize. The following is a list of sinkholes, blue holes, dolines, crown holes, cenotes, and pit caves. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.

  7. ‘Blue hole’ is largest ever discovered at 1.3K feet deep ...

    www.aol.com/blue-hole-largest-ever-discovered...

    However, scholarship on blue holes is often limited as the lack of oxygen — these portals are filled with the gas hydrogen sulfide — makes it perilous for people to venture into the abyss sans ...

  8. Scientists Are Planning on Plunging Into the World's 'Portal ...

    www.aol.com/lifestyle/scientists-planning...

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  9. Cenote - Wikipedia

    en.wikipedia.org/wiki/Cenote

    The Sacred Cenote at Chichen Itza, Mexico. Cenotes are surface connections to subterranean water bodies. [5] While the best-known cenotes are large open-water pools measuring tens of meters in diameter, such as those at Chichen Itza in Mexico, the greatest number of cenotes are smaller sheltered sites and do not necessarily have any surface exposed water.