Gilboa Stone Quarry, located near Findlay Ohio is a popular place amongst divers.  The dive shop that I divemaster with in Essex, Ontario, uses the quarry for their open water check out dives.  The quarry is about 14 square acres in size, includes camp sites, bunk houses, food and heated changing rooms.   I like playing at Gilboa.  It ranges in depth from "walk-in" ankle depth of water to approximately 135 feet over the north wall.   If you click the slide show, you can see some of the sites that Gilboa offers.