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 southwest of the Cedar Point amusement park in Sandusky, Ohio.
Location: Castalia, Erie County, Ohio
Etymology: From the color and the shape of the pond