Garden Island (South Australia)
Aerial view looking WSW of part of the Port River estuary with Garden Island being located in the top right hand corner adjacent to Torrens Island
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| Geography | |
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| Location | Gulf St Vincent |
| Coordinates | 34°48′26″S 138°32′04″E / 34.807170°S 138.534450°ECoordinates: 34°48′26″S 138°32′04″E / 34.807170°S 138.534450°E |
| Area | 150 ha (370 acres) |
| Administration | |
| Demographics | |
| Population | 10 (shared with Torrens Island) |
| Coordinates Population |
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Garden Island is an island in the Australian state of South Australia located about 14 kilometres (8.7 mi) north-west of the capital city of Adelaide in an estuary system within the Adelaide metropolitan area which drains into Gulf St Vincent. It is notable as being a site for a mangrove forest, a landfill, a part of the site for the Multifunction Polis, a ship graveyard and a venue for recreational boating activities. It has enjoyed protected area status since 1973.
Garden Island is located in Gulf St Vincent within the Port River estuary about 15 kilometres (9.3 mi) north-west of the Adelaide city centre and to the immediate south-east of Torrens Island. It is completely located within the suburb of Garden Island.
It is surrounded by the following bodies of water - Angas Inlet to the north, Eastern Passage to the east and North Arm to the south.
Access to the island is via road or via boat. Road access from the mainland is via a bridge while boat ramps are located at three places along the northern coast of the island. All three boat ramps are connected to a road system that runs from the above-mentioned bridge. A electric power transmission line crosses the island in an east-west direction to a termination point at the Torrens Island Power Station.
Garden Island is one of the geographical features in what is now the Adelaide metropolitan area that was formed as a consequence of sea level rise at the start of the Holocene. Sea level rise had three consequences. Firstly, watercourses existing at the time were forced to create new mouths in new coastline. Secondly, currents arising along the new coastline formed beaches, a coastal dune system and ultimately the spit known as the Lefevre Peninsula all by the process of longshore drift. Finally, watercourses such at the River Torrens and the Sturt River were forced to flow north to what is now the Port River estuary after being prevented from draining into Gulf St Vincent by the emerging coastal dune system with result of forming features such as Torrens Island and Garden Island.
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