The property includes a selection of 11 penal sites, among the thousands established by the British Empire on Australian soil in the 18th and 19th centuries. The sites are located on the fertile costal strip, where the expanding colonial settlements of which the convict sites were central part, led to large-scale disruption and conflict and with the aboriginal peoples.
This was mainly around Sydney and in Tasmania, as well as on Norfolk Island and in Fremantle. They housed tens of thousands of men, women and children condemned by British justice to transportation to the convict colonies. Each of the sites had a specific purpose, in terms both of punitive imprisonment and of rehabilitation through forced labour to help build the colony. The property presents the best surviving examples of large-scale convict transportation and the colonial expansion of European powers through the presence and labour of convicts.