Blue Hole (Castalia)
The Blue Hole is a fresh water pond 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 southwest of the Cedar Point amusement park in Sandusky, Ohio.
Blue Hole (Rawley Springs)
The swimming hole has not been developed with a parking area and easy access, although for some this is also the allure. Most people park on the shoulder of Route 33 just past Rawley Springs heading west. A short but steep climb down to the river follows. The path's location is unmarked but worn enough to be noticeable.