# Nobby Islet

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Island in South Australia

Nobby Islet View of Seal Bay looking west with Nobby Islet in background Nobby Islet Geography Location Great Australian Bight Administration Australia

**Nobby Islet** (also known as Knobby Island and Nobby Island) is an [islet](/source/Islet) located in the [Great Australian Bight](/source/Great_Australian_Bight) off the south coast of [Kangaroo Island](/source/Kangaroo_Island) in the [Australian state](/source/Australia) of [South Australia](/source/South_Australia) approximately 50 kilometres (31 miles) south-west of [Kingscote](/source/Kingscote%2C_South_Australia). It is currently part of the [Seal Bay Conservation Park](/source/Seal_Bay_Conservation_Park).

## Description

Nobby Islet is approximately 50 kilometres (31 miles) south-west of Kingscote and about 9.2 kilometres (5.7 miles) east of Point Ellen in [Vivonne Bay](/source/Vivonne_Bay_(South_Australia)) and within 200 metres (660 feet) of the coast at Seal Bay. The islet is reported as being cylindrical in shape with almost vertical sides and finished with a flat top. It is 75 metres (246 feet) high and has an area of 12 hectares (30 acres).[1][2] The islet is difficult to access due to its location in shallow water adjoining a [cliffed coastline](/source/Cliffed_coast) that exposed to rolling seas and the fragile condition of its vertical cliff faces. A survey carried out by the responsible government agency in 1996 used a [helicopter](/source/Helicopter) to access the islet's summit.[1]

## Formation, geology and oceanography

Nobby Islet may have been formed as recently as 6000 years ago due to the relatively shallow depth of the water surrounding it.[2][3] As of 1996, the islet is reported as appearing to be entirely composed of a [limestone](/source/Limestone) known as Bridgewater Formation [calcarenite](/source/Calcarenite). It is also observed that there was recent evidence of rockfalls due to the crumbly consistency of the calcarenite and that debris cones were present on its relatively sheltered northern side while any collapsed materials on its southern face had been washed away by wave action. The islet's summit was also reported as being 'gently terraced by resistant layers of calcrete that retain bands of sandy soil'.[1] Nobby Islet is technically a [sea stack](/source/Stack_(geology)). The islet is located in waters of a depth of about 5.5 metres (18 feet) that partially conceal [wave-cut platforms](/source/Wave-cut_platform) and that are subject to rolling seas.[2]

## Flora and fauna

As of 1996, the cliff faces were relatively un-vegetated. The islet's summit was occupied by clumps of [Coast tussock-grass](/source/Coast_tussock-grass) with a fringing [shrubland](/source/Shrubland) dominated by [Coast Daisy-bush](/source/Olearia_axillaris). The 25 other species were identified including Dry land Tea-tree, [Coast Beard-heath](/source/Coast_Beard-heath), [Common correa](/source/Common_correa), [Cotton bush](/source/Cotton_bush), [Thyme Riceflower](/source/Thyme_Riceflower), [pointed twinleaf](/source/Zygophyllum), [Black-anther Flax Lily](/source/Dianella_revoluta), [Common Wallaby Grass](/source/Common_Wallaby_Grass) and Downy Dodder-laurel. The only animal life observed in 1996 was an [Osprey](/source/Osprey) nest located on the islet's northern side, [white-faced storm petrels](/source/White-faced_storm_petrel) which were nesting in shallow burrows located over the entire summit and two species of [lizard](/source/Lizard) - the [marbled gecko](/source/Christinus_marmoratus) and the [bull skink](/source/Egernia).[1]

## Protected areas status

Nobby Islet originally obtained [protected area](/source/Protected_area) status as a fauna reserve under the former *Fauna Conservation Act 1964* and then as a fauna conservation reserve declared under the *Crown Lands Act 1929-1966* on 16 March 1967.[4][5] Since 1971, the waters surrounding the islet have been part of the [Seal Bay Aquatic Reserve](/source/Seal_Bay_Aquatic_Reserve).[6][7] As of 1996, it was described as being included in Seal Bay Conservation Park.[8] As of 2012, the waters surrounding its shores are part of a restricted access zone located within the boundaries of the [Southern Kangaroo Island Marine Park](/source/Southern_Kangaroo_Island_Marine_Park_(state_waters)).[9]

## References

1. ^ [***a***](#cite_ref-page298-300_1-0) [***b***](#cite_ref-page298-300_1-1) [***c***](#cite_ref-page298-300_1-2) [***d***](#cite_ref-page298-300_1-3) Robinson, A. C.; Canty, P.; Mooney, T.; Rudduck, P. (1996). ["South Australia's offshore islands"](http://www.environment.sa.gov.au/files/5a7dbb25-70b9-4ceb-bbfd-a25800961994/offshore-islands-gen.pdf) (PDF). Australian Heritage Commission. pp. 298–300. Retrieved 13 December 2013.

1. ^ [***a***](#cite_ref-Chart14_2-0) [***b***](#cite_ref-Chart14_2-1) [***c***](#cite_ref-Chart14_2-2) South Australia. Department of Marine and Harbors (1985), *The Waters of South Australia a series of charts, sailing notes and coastal photographs*, Dept. of Marine and Harbors, South Australia, pp. Chart 14, [ISBN](/source/ISBN_(identifier)) [978-0-7243-7603-2](https://en.wikipedia.org/wiki/Special:BookSources/978-0-7243-7603-2)

1. **[^](#cite_ref-page11_3-0)** Robinson, A. C.; Canty, P.; Mooney, T.; Rudduck, P. (1996). ["South Australia's offshore islands"](http://www.environment.sa.gov.au/files/5a7dbb25-70b9-4ceb-bbfd-a25800961994/offshore-islands-gen.pdf) (PDF). Australian Heritage Commission. p. 11. Retrieved 13 December 2013.

1. **[^](#cite_ref-page140_4-0)** Robinson, A. C.; Canty, P.; Mooney, T.; Rudduck, P. (1996). ["South Australia's offshore islands"](http://www.environment.sa.gov.au/files/5a7dbb25-70b9-4ceb-bbfd-a25800961994/offshore-islands-gen.pdf) (PDF). Australian Heritage Commission. p. 140. Retrieved 13 December 2013.

1. **[^](#cite_ref-FCR-1967_5-0)** ["Crown Lands Act, 1929–1966: Fauna Conservation Reserves Dedicated"](http://www8.austlii.edu.au/au/other/sa_gazette/1967/11.pdf) (PDF). *The South Australian Government Gazette*. Government of South Australia. 16 March 1967. pp. 961–962. Retrieved 5 February 2018.

1. **[^](#cite_ref-sa-capad-2002-me_6-0)** ["Summary of SA Marine Protected Areas by Type (see 'SA Reserve List' tab)"](http://www.environment.gov.au/system/files/pages/59d8b000-6fc9-4470-b0ba-517ba3aeae44/files/sa-capad-2002-me.xls). Australian Government - Department of the Environment. 10 February 2003. Retrieved 5 October 2014.

1. **[^](#cite_ref-AR14-15_7-0)** Primary Industries and Regions South Australia (PIRSA) (2007), [*Aquatic Reserves: SEAL BAY - BALES BEACH*](https://web.archive.org/web/20150919012307/http://www.pir.sa.gov.au/__data/assets/pdf_file/0018/65412/14_15._AqResWeb.pdf) (PDF), Primary Industries and Regions South Australia, archived from [the original](http://www.pir.sa.gov.au/__data/assets/pdf_file/0018/65412/14_15._AqResWeb.pdf) (PDF) on 19 September 2015

1. **[^](#cite_ref-page147_8-0)** Robinson, A. C.; Canty, P.; Mooney, T.; Rudduck, P. (1996). ["South Australia's offshore islands"](http://www.environment.sa.gov.au/files/5a7dbb25-70b9-4ceb-bbfd-a25800961994/offshore-islands-gen.pdf) (PDF). Australian Heritage Commission. p. 147. Retrieved 13 December 2013.

1. **[^](#cite_ref-9)** ["Southern Kangaroo Island Marine Park Management Plan 2012"](http://www.environment.sa.gov.au/files/68e0453b-376d-4429-a4dd-a11700a21e42/mp-gen-17southernkangarooisland-managementplan.pdf) (PDF). Department of Environment Water and Natural Resources. 2012. pp. 24/26. Retrieved 13 May 2014.

v t e Kangaroo Island Major townships American River Kingscote Parndana Penneshaw Beaches American Beach Baudin Beach Brown Beach D'Estrees Bay Emu Bay Island Beach Nepean Bay Vivonne Bay Coastal features Western end of island Cape Borda Cape du Couedic Cape Gantheaume D'Estrees Bay Fides Bluff Maupertuis Bay Nepean Bay Pelican Lagoon Point Marsden Ravine des Casoars Stokes Bay Vivonne Bay Dudley Peninsula Cape St Albans Cape Willoughby Kangaroo Head Moncrieff Bay Pink Bay Protected areas National parks Flinders Chase Conservation parks Baudin Beatrice Islet Beyeria Busby Islet Cape Gantheaume Cape Willoughby Cygnet Estuary Dudley Kelly Hill Lashmar Lathami Lesueur Mount Taylor Nepean Bay Parndana Pelican Lagoon Seal Bay Seddon Simpson Vivonne Bay Marine parks Encounter Western Kangaroo Island Southern Kangaroo Island Wilderness Protection Areas Cape Bouguer Cape Gantheaume Cape Torrens Ravine des Casoars Western River Islands adjacent to Kangaroo Island coast Beatrice Islets Busby Islet Casuarina Islets Douglas Rock Nobby Islet Paisley Islet Pelican Lagoon Islets Pelorus Islet Related and uncategorised 2007 Kangaroo Island bushfires County of Carnarvon Fleurieu and Kangaroo Island Hundred of Dudley Kangaroo Island Council Kangaroo Island wine region Kingscote Airport Middle River Reservoir Category Commons

v t e Islands of South Australia West coast of Eyre Peninsula Generally Avoid Bay Islands Black Rocks Sudden Jerk Baird Bay Jones Unnamed Cap Eba Germein Greenly Liguanea Neptune Islands Nicolas Baudin Nuyts Reef Olive Pigface Price Purdie Rocky Island (north) Rocky Island (south) Sinclair Curta Rocks Whidbey Isles Four Hummocks Perforated Price Island Golden Williams Investigator Group Flinders Pearson Isles Pearson Dorothee Veteran Isles Topgallant Waldegrave Islands Ward Islands Nuyts Archipelago Blefescu Breakwater Evans Eyre Franklin Gliddon Reef Goat Isles of St Francis Dog Egg Fenelon Freeling Hart Masillon Smooth St Francis West Lacy Lounds Lilliput Purdie Islands St Peter Spencer Gulf Generally Bicker Isles Bird Boston Curlew Entrance Gambier Islands Wedge Grantham Goose Green Lipson Louth Rabbit Shag Tumby Wardang Weeroona Jussieu Peninsula coastline Carcase Rock Donington Grindall Hopkins Lewis Little Owen Smith Taylor Thistle Sir Joseph Banks Group Blyth Boucaut Dalby Dangerous Reef Duffield English Hareby Kirkby Langton Lusby Marum Partney Reevesby Roxby Seal Rock Sibsey Spilsby Stickney Winceby Pondalowie Bay Royston Middle South Investigator Strait Althorpe Islands Althorpe Haystack Seal Chinamans Hat Kangaroo Island Main article Kangaroo Island Nepean Bay Beatrice Islets Busby Islet Pelican Lagoon Islets West and south coasts Casuarina Islets Douglas Rock Lipson Reef Nobby Islet North Rock Paisley Islet Pelorus Islet South West Rock Unnamed island (Hanson Bay) Young Rock Gulf St Vincent Garden Torrens Troubridge Backstairs Passage The Pages Encounter Bay and adjoining waters Granite Pullen Seal West Wright South east coast Baudin Rocks Penguin Mainland Artificial islands Delfin Murray River List of Murray River islands Hindmarsh Pomanda Category Commons

[36°00′S 137°17′E / 36.000°S 137.283°E / -36.000; 137.283](https://geohack.toolforge.org/geohack.php?pagename=Nobby_Islet&params=36_00_S_137_17_E_region:AU_type:isle_source:GNS-enwiki)

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Adapted from the Wikipedia article [Nobby Islet](https://en.wikipedia.org/wiki/Nobby_Islet) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Nobby_Islet?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.