Blue Hole postcard   Save
Blue Hole, Castalia, Ohio
Description: Postcard with the caption "The Famous Blue Hole, Castalia, Ohio." The Blue Hole is a large spring fed by an underground river. The depth of the Blue Hole is unknown. It maintains a water temperature of 48 degrees year round. View on Ohio Memory.
Image ID: AL03464
Subjects: Erie County (Ohio); Ohio History--Natural and Native Ohio; Tourism
Places: Castalia (Ohio); Erie County (Ohio)