Garden Island (South Australia)

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 varying degrees of protected area status since 1973.

Garden Island
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
Garden Island
LocationGulf St Vincent
Coordinates34°48′26″S 138°32′04″E[1]
Area150 ha (370 acres)[2]
Population0 [3]


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.[1]

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.[4][1]

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. An electric power transmission line crosses the island in an east-west direction to a termination point at the Torrens Island Power Station.[4]

Formation, geology and oceanography

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.[5][4]

Flora and fauna


The principal plant species is Avicennia marina (Grey or white mangrove) which has colonized the coastline of Garden Island within the intertidal zone, particularly the island’s east end.[5]


European use

Since 1836, the land tenure has mainly been that of crown land. A third of the island on its western side was dedicated to the South Australian Harbors Board and in 1962, the entire island was dedicated as a reserve under Harbors Board control. The first public road was opened for public use in 1968. The use of the island as a base for recreational boating and as a landfill site began in the 1970s.[6]

Landfill site

Garden Island was the site of a landfill from about 1972 until 2000. This activity occupied 54 hectares (130 acres) of the island’s 150 hectares (370 acres) and “served the domestic waste disposal needs for almost half of Adelaide.” Landfill gas is managed by an extraction system commissioned in 2015.[6][2] As of 2014, land filling is still permitted by planning statute on the island in sections 463 and 464 of the cadastral unit of the Hundred of Port Adelaide.[7]

Multifunction Polis

Garden Island which is located within the Adelaide metropolitan area was proposed as one of the sites for the Multifunction Polis, which was a planned community with a projected population of 250,000 proposed in 1987 and which was abandoned in 1998.[8] As of 2014, land including Garden Island which was intended to be the site of the multifunction polis was still zoned for that purpose.[7]

Ship graveyard

In years between 1909 and 1945, the southern coast line of Garden Island was used as a ship graveyard for the disposal of about 25 vessels including Dorothy H. Sterling and Santiago. The ship graveyard is promoted by the Government of South Australia as a canoeing trail.[9][10][6]

Recreational and tourism uses

Since the 1970s, Garden Island has been used as a venue for recreational boating activities associated with adjoining bodies of water such as the Barker Inlet and Port River.[4][10][6]

Protected area status

Garden Island has been located within the boundaries of the following protected areas to varying extents since 1973, 2005 and 2014 respectively - the Barker Inlet-St Kilda Aquatic Reserve covers all of the island below high water, the Adelaide Dolphin Sanctuary overlays the entire island, and the Torrens Island Conservation Park includes some land exposed at low water at the east end of the island.[1][11][12][13]

See also


  1. "Search results for 'Garden Island' with the following datasets selected – 'Suburbs and Localities', 'Dolphin Sanctuary', 'Aquatic Reserves', 'NPW and Conservation Properties', 'Hundreds', 'Roads', 'Metropolitan Adelaide Boundary (Development Act 1993)' and 'Gazetteer'". Location SA Map Viewer. South Australian Government. Retrieved 24 October 2019.
  2. "Garden Island Landfill Rehabilitation Completed". Tonkin Consulting. Retrieved 19 March 2016.
  3. Australian Bureau of Statistics (27 June 2017). "Garden Island (SA)". 2016 Census QuickStats. Retrieved 9 March 2018.
  4. Boating Industry Association of South Australia (BIA); South Australia. Department for Environment and Heritage (2005), South Australia's waters an atlas & guide, Boating Industry Association of South Australia, p. 194, ISBN 978-1-86254-680-6
  5. Johnston, Greg; Harbison, Pat (2005). Daniels, Christopher B; Tait, Catherine J (eds.). Adelaide : nature of a city : the ecology of a dynamic city from 1836 to 2036. Adelaide: University of Adelaide, Biocity : Centre for Urban Habitats. pp. 286–311. ISBN 978-0-9758115-1-1. Retrieved 18 March 2016.
  6. Richards, Nathan (1997). The History And Archaeology of the Garden Island Ships' Graveyard, North Arm of the Port Adelaide River, Port Adelaide, South Australia (PDF) (Honours degree). Flinders University. pp. 28–30. Retrieved 18 March 2016.
  7. Land Not Within a Council Area (Metropolitan) Consolidated – 25 September 2014 (PDF). Department of Planning, Transport and Infrastructure (DPTI). 2014. pp. 58–60.
  8. Hamilton, Walter (Walter Stuart); Hamilton, Walter; Australian Broadcasting Corporation; ABC Enterprises (1991), Serendipity city : Australia, Japan and the multifunction polis, ABC Books, ISBN 978-0-7333-0087-5
  9. "Garden Island Ships' Graveyard Maritime Heritage Trail interpretive signs" (PDF). Department for Environment and Heritage. 2007. Retrieved 19 March 2016.
  10. "Garden Island". Office for Recreation & Sport. Retrieved 19 March 2016.
  11. "Protected Areas Information System Reserve List" (PDF). Government of South Australia. 14 December 2016. Retrieved 27 December 2017.
  12. "The Adelaide Dolphin Sanctuary". Natural Resources Management Adelaide and Mount Lofty Ranges. Retrieved 19 March 2016.
  13. "Aquatic reserves, Barker Inlet – St Kilda" (PDF). Primary Industries and Regions SA (PIRSA). Archived from the original (PDF) on 10 October 2016. Retrieved 19 March 2016.

Further reading

  • Hartell, Robyn; Richards, Nathan Troy; Heritage South Australia (2001), Garden Island : ships' graveyard, Heritage South Australia, ISBN 978-0-7308-5894-2
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