Margaret Brock Reef

Margaret Brock Reef is a reef on the Limestone Coast of South Australia, lying about 7 kilometers west of Cape Jaffa and about 27 kilometers southwest of Kingston SE, rising to about 2 meters above sea level at low tide. Discovered by the Baudin expedition in April 1802 and known for decades afterward as Sesostris Reef, it took its present name after the barque Margaret Brock wrecked on it on 23 November 1852, with the new name appearing in The Australian Directory by 1879. The reef carries the Cape Jaffa Lighthouse, built between 1868 and 1872 and decommissioned in 1973 and since replaced by an automatic beacon, and since 1973 has been a rock lobster sanctuary closed to fishing within a one kilometer radius.