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Fort Cowan Cowan is a heritage-listed World War II fortification at 30 Jessie Wadsworth Street, Moreton Island, City of Brisbane, Queensland, Australia. It is also known as RAN 3 Cowan Cowan, Fort Cowan and Cowan Cowan Battery. It was added to the Queensland Heritage Register on 1 October 2007. The fort's main armament consisted of two BL 6 inch Mk XI naval guns.