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Blowing Rocks Preserve is a 73-acre (30 ha) environmental preserve on Jupiter Island in Hobe Sound, Martin County, Florida, USA, extending longitudinally between the southernmost Indian River and the Atlantic Ocean. Local residents gifted The Nature Conservancy with the site in 1969, which it has established and owned as a preserve since. It contains the largest limestone outcropping on the state's east coast, part of the Anastasia Formation. Breaking waves spray plumes of water up to 50 feet (15 m) in height through erosional holes, hence the moniker blowing rocks; this distinctive spectacle thus earned the limestone outcrop's name. The limestone outcropping also encompasses coquina, crustaceans, and sand, protruding visibly from the beach. The preserve also features several natural communities, including oak and tropical hardwood hammock; mangrove swamp, salt marsh, mudflats, and an estuary; and coastal strand and oceanside dunes. Common native plants include sea grapes, gumbo limbo, coral bean, and Sabal palms. Migratory birds such as warblers, seabirds, and raptors (mainly falcons and hawks) frequent the preserve; three sea turtle species-loggerhead, green, and leatherback-nest on the beach as well. The preserve includes an educational center, native plant nursery, boardwalk, oceanside path, and butterfly garden.