Garden Island is an inner-city locality of Sydney, in the state of New South Wales, Australia. It is located to the north-east of the Sydney central business district, north of the suburb of Potts Point. Garden Island is the site of Fleet Base East of the Royal Australian Navy (RAN). Situated above Garden Island on the Potts Point ridgeline is HMAS Kuttabul, the RAN's administrative, training and logistics support establishment for the Sydney area, named after the converted ferry HMAS Kuttabul which was sunk near Garden Island in Sydney Harbour by a Japanese midget submarine in May 1942. Garden Island is the principal east coast naval base of the RAN, and home port to many of the RAN's major ships.