Garden Island is an inner-city locality of Sydney, Australia, and the location of a major Royal Australian Navy (RAN) base. It is located to the north-east of the Sydney central business district and juts out into Port Jackson, immediately to the north of the suburb of Potts Point. Used for government and naval purposes since the earliest days of the colony of Sydney it was originally a completely detached island. It was joined to the Potts Point shoreline by major land reclamation work during World War II.