Lying off the north of the island, this is a fringing reef at the southwestern edge of Campbell's Bay/Donald Duck Bay. It derives it's name from a giant rock formation on the surface, resembling a turtle. Granite boulders slope down to a sandy bottom, in the shape of a canyon. Anemones, fields of staghorn and other hard corals, feather stars and soft tree corals can be observed at around 12m, with vibrant Gorgonian corals at 20m. Fish life is abundant, including encounters with coral trout, blue-ringed angelfish, longnose filefish, and damselfish. Depths 10 - 28m. Visibility 18 - 24m. Easy to intermediate dive.