Proclamation to establish Australia's territorial sea. Country/Territory Australia Document type Miscellaneous Date 1990 Source FAO, FAOLEX Subject Sea Keyword Maritime zone Territorial sea Geographical area Asia and the Pacific, Australia and New Zealand, Indian Ocean, Oceania, South Pacific Abstract On 20 November 1990, the territorial sea of Australia is extended from three to twelve nautical miles in accordance with the Law of the Sea Convention. The extended breadth of the territorial sea will allow Australia to more effectively control Australia's marine envirnment and its living and non-living resources. Full text English Website www.un.org