A round inland blue hole on the edge of Rock Sound village, the Ocean Hole is essentially a vertical-sided sinkhole connected to the open sea by a flooded cave system. The water is clear, deep, and full of yellowtail snapper, sergeant majors, and the occasional tarpon.
Locals feed the fish from the small concrete observation platform at the rim. The water is fresh on the surface and saltier deeper down; swimming is possible if you are careful of the sheer walls. Free to visit, no facilities.