Bare Island is an islet in south-eastern Sydney, in the state of New South Wales, in eastern Australia. The islet is located about 16 kilometres (9.9 mi) south east of the Sydney central business district, within Botany Bay, close to the bay's northern headland. Containing fortification facilities, Bare Island is listed on the State Heritage Register and is significant as an almost completely intact example of late nineteenth century coastal defence technology.