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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. 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.

  4. Template:Location map/List - Wikipedia

    en.wikipedia.org/wiki/Template:Location_map/List

    Location map templates as of 5 Nov 2014. To find the best location map template covering a given place, open the SVG file in a Web browser and use arrow keys and zoom function. Hovering over a region shows its name and highlights it. Clicking it loads its page. This is a list of all Location map templates as of July 22, 2021.

  5. File:The Famous Blue Hole, Castalia, Ohio (Date Unknown).jpg

    en.wikipedia.org/wiki/File:The_Famous_Blue_Hole...

    Publisher: Genuine Curteich-Chicago "C.T. Art-Colortone" post card, a trade name under Curt Teich Co., Chicago, Illinois Distributor: Geo. H. Tremper, Sandusky, Ohio Estimated Date: 1930-1940s Era: Linen Era Condition: Unused. The Blue Hole is a freshwater pond and was a tourist site from the 1920s to 1990 and had 165,000 visitors annually.

  6. 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 ...

  7. Template:Blue holes - Wikipedia

    en.wikipedia.org/wiki/Template:Blue_holes

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  8. AOL

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    The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

  9. 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). Blue holes typically ...