Blowing Rocks Preserve is an environmental preserve on Jupiter Island in Hobe Sound, Martin County, Florida, USA. It is owned by The Nature Conservancy. It contains the largest Anastasia limestone outcropping on the state's east coast.[1] Breaking waves spray plumes of water through erosion holes;[2] the spray can reach heights of 50 feet (15 m).[1] This distinctive spectacle thus earned the limestone outcrop's name. The limestone outcropping also encompasses coquina shells, crustaceans, and sand.[2]