|Location||Gulf St Vincent|
|Area||2 ha (4.9 acres)|
|Highest elevation||5 m (16 ft)|
Troubridge Island is an island located in the south west corner of Gulf St Vincent in South Australia near the eastern edge of the Troubridge Shoals off the east coast of Yorke Peninsula about 8 kilometres (5.0 mi) southeast by east of the town of Edithburgh It is notable for being a site of an operating lighthouse from 1856 until 2002 and as a site for a sea bird rookery. Since 1982, the island has been part of the Troubridge Island Conservation Park.
Troubridge Island is located approximately 8 kilometres (5.0 mi) southeast by east of the town of Edithburgh near the eastern edge of the Troubridge Shoals. It is a ‘crest of sand’ which is permanently above high tide and which is stabilised by the presence of vegetation. At high water, the Island had an area of 2 hectares (4.9 acres) and a height of 5 metres (16 feet) as of 1996. At low water, its intertidal zone extends for at least one kilometre (0.62 mi) from its high water mark. The island is most accessible at high tide, when there is sufficient water over the intertidal zone to allow a boat reach the permanently dry land. Since 1988, access to the island has been restricted to these with permits provided by the Department of Environment, Water and Natural Resources.
Most of the 31 plant species recorded from the island are introduced. The vegetation consists of low shrubland dominated by nitre bush, grey saltbush and African boxthorn. Other prominent plants present are tree mallow, sea rocket, marram grass and hairy spinifex.
Fauna on Troubridge Island is represented by both birds and reptiles. As of 2009, almost 60 native bird species have been recorded including 21 species of conservation significance and 22 species listed as migratory. Dominant species include black-faced cormorants, Caspian terns, crested terns and fairy terns, Pacific gulls, little penguins, pied cormorants and silver gulls.
As of 1996, starlings, an introduced species, is reported as having a population of 10,000 and was "competing with native species for roosting sites and fouling the keepers' cottages."The following reptile species have been recorded on Troubridge Island: marbled geckos and sleepy lizards.
Troubridge Island's little penguin colony was approximately 3000-5000 birds during the 1980s. In 2009, its population was estimated to be 3010 breeding adults. In 2011, the colony was believed to be stable.A census conducted in 2013 estimated a total population of 270 breeding adults, showing a severe and unexplained decline.
Matthew Flinders discovered the Troubridge Shoals on 1 April 1802, however he did not report the existence of the island.
A lighthouse known as the Troubridge Island Lighthouse was erected on the island as a means to reduce shipping losses caused by the strandings on the Troubridge Shoals. It was first lit in 1856. It was converted to automatic operation in 1981 and its role as a navigation aid was taken over progressively from 1980 by a new lighthouse located on Troubridge Hill on Yorke Peninsula to the west of Troubridge Island. It was decommissioned in 2001.
In 1981, the island was sold to the South Australian Government who proceeded with the establishment of the Troubridge Island Conservation Park. The land associated with the lighthouse being leased by the Australian Maritime Safety Authority (AMSA). In 1993, the lease was transferred to the South Australian Government for the remainder of its term.
Troubridge Island is part of Troubridge Shoals which extend across to Yorke Peninsula and constitutes a hazard to shipping. Troubridge Shoals has been the cause of over 33 wrecks and groundings. During the period October 1849 to May 1850, at least seven vessels ran aground.precipitating the erection of a lighthouse in 1855.
When the Parsee was wrecked on the shoals on 13 November 1838 the survivors landed at the adjacent Troubridge Island.
Marion Reef, south of Troubridge Island, was named for the Marion, which ran aground in 1851 as did many others, has been (incorrectly) identified as part of Troubridge Shoals.
Troubridge Island has been part of the Troubridge Island Conservation Park since 1982. In 1986, the park was extended for a distance about 1 kilometre (0.62 miles) around the island to cover most of the sandbar of which the island is part. Since 2012, the island has been located within the boundaries of the Lower Yorke Peninsula Marine Park.
The island (and some of the adjoining sandbar exposed at low tide) has been nominated as an Important Bird Area (IBA) known as the Troubridge Island Important Bird Area by BirdLife International. The basis for the nomination is that the IBA supports over 1% of the world populations of both black-faced cormorants (with up to 4000 individuals) and silver gulls (with up to 10,000 breeding pairs) as well as supporting "significant numbers of the vulnerable Fairy Tern".
Dhilba Guuranda–Innes National Park, formerly Innes National Park, is an IUCN-designated protected area in the Australian state of South Australia located on the southwest tip of Yorke Peninsula about 300 kilometres (190 mi) west of the state capital of Adelaide. It is a popular destination for camping, bushwalking, fishing, surfing and scuba diving.
Flinders Island is an island in the Investigator Group off the coast of South Australia approximately 32 kilometres (20 mi) west of mainland town Elliston. It was named by Matthew Flinders after his younger brother Samuel Flinders, the second lieutenant on HMS Investigator in 1802.
Investigator Strait is a body of water in South Australia lying between the Yorke Peninsula, on the Australian mainland, and Kangaroo Island. It was named by Matthew Flinders after his ship, HMS Investigator, on his voyage of 1801–1802. It is bordered by the Gulf St Vincent in the northeast.
The Investigator Group is an archipelago in South Australia that consists of Flinders Island and five island groups located off the western coast of the Eyre Peninsula. It is named after HMS Investigator by her commander, Matthew Flinders when he explored the area in 1802. The Group lies within the Great Australian Bight. All the islands except Flinders Island, and a part of Pearson Island, are within the Investigator Group Wilderness Protection Area and the Waldegrave Islands Conservation Park.
The Backstairs Passage is a strait in South Australia lying between Fleurieu Peninsula on the Australian mainland and Dudley Peninsula on the eastern end of Kangaroo Island. The western edge of the passage is a line from Cape Jervis on Fleurieu Peninsula to Kangaroo Head on Kangaroo Island. The Pages, a group of islets, lie in the eastern entrance to the strait. About 14 km wide at its narrowest, it was formed by the rising sea around 13,000 years ago, at the end of the Pleistocene era, when it submerged the land connecting what is now Kangaroo Island with the Fleurieu Peninsula. Backstairs Passage was named by Matthew Flinders whilst he and his crew on HMS Investigator were exploring and mapping the coastline of South Australia in 1802.
Goose Island is a small (2 ha), rocky island lying about 550 m from the northern end of the much larger Wardang Island, off the west coast of the Yorke Peninsula, in the Spencer Gulf of South Australia. Rising to a height of 26 m, its vegetation is dominated by African boxthorn on clay and calcarenite soils. The waters surrounding the island are protected in the Goose Island Aquatic Reserve. The island is leased from the Department of Environment, Water and Natural Resources by Scotch College and is co-managed by the two parties.
Troubridge Island Conservation Park is a protected area includes all of Troubridge Island and some adjoining waters about 8 kilometres East-southeast of Edithburgh in South Australia and about 74 kilometres southwest of Adelaide. The park was proclaimed in 1982 under National Parks and Wildlife Act 1972 ‘to conserve sea-bird rookeries and to preserve heritage values of a lighthouse and associated keepers’ cottages’. In 1986 the park was extended to include an area of intertidal waters around the island. The conservation park is classified as an IUCN Category III protected area.
The Althorpe Islands are a group of islands in the Investigator Strait, off the south-western tip of Yorke Peninsula, South Australia. The group includes Althorpe Island and two rocky islets immediately to its west known as The Boobs. These are located 7.7 km south-southwest of Cape Spencer on the mainland. Closer inshore are Seal Island and Haystack Island, which together with Althorpe Island and The Boobs constitute the Althorpe Islands Conservation Park. A management plan for the Althorpe Islands Conservation Park was adopted in 2009. The islands are uninhabited and can only be accessed by sea or by helicopter.
Troubridge Hill Lighthouse is a lighthouse located on Troubridge Hill on the south coast of Yorke Peninsula in South Australia about 13.5 kilometres south west of Edithburgh and about 3.7 kilometres west of Troubridge Point.
Seal Island is an island located in Investigator Strait off the south coast of Yorke Peninsula in the Australian state of South Australia about 7 kilometres south south-west of Stenhouse Bay. Since 1972, it has been part of the Althorpe Islands Conservation Park.
Troubridge Hill is a hill on the south coast of Yorke Peninsula in South Australia located in the locality of Honiton about 13.5 kilometres south west of Edithburgh and about 3.8 kilometres west of Troubridge Point. It was discovered, reported as being a ’hummock upon this low part ’ and named by Matthew Flinders on 24 March 1802 after Sir Thomas Troubridge, 1st Baronet. Since 1980, it has been the site of an operating lighthouse known as the Troubridge Hill Lighthouse. Its adjoining coastline borders a protected area of the same name - the Troubridge Hill Aquatic Reserve.
Sultana Point is a headland in the Australian state of South Australia located near the south east tip of Yorke Peninsula in the gazetted locality of Sultana Point about 3.3 kilometres south-southeast of the town of Edithburgh. The waters to its immediate east contain the shoal system known as the Troubridge Shoals. It is one of the natural features named after the Sultana, a ship which was wrecked on the Troubridge Shoals on 28 September 1849. The waters adjoining its shores are located within the boundaries of the Lower Yorke Peninsula Marine Park.
Baudin Rocks, also previously known as the Godfrey Islands, is a group of islets on the south east coast of in the Australian state of South Australia about 8.3 kilometres North-northwest of Robe. The islet group was discovered and named by Matthew Flinders in 1802 after Nicolas Baudin. The group has had protected area status since 1965 and since 1972, the group has been part of the Baudin Rocks Conservation Park.
Busby Islet is an islet in the Australian state of South Australia located in Nepean Bay on the north coast of Kangaroo Island about 2 kilometres north of the municipal seat of Kingscote. The islet and adjoining areas are notable as habitat for bird life. The islet has enjoyed protected area status since 1909 and since at least 1972, have been part of the Busby Islet Conservation Park.
Nicolas Baudin Island is an island in the Australian state of South Australia about 500 metres west of Cape Blanche on the west coast of Eyre Peninsula about 25 kilometres south south-west of the town of Streaky Bay. The island is notable as a breeding site for Australian sea lions. The island has enjoyed protected area status since 2003 when it became part of the Nicolas Baudin Island Conservation Park.
Troubridge Island Lighthouse is a decommissioned lighthouse in the Australian state of South Australia located on Troubridge Island in Gulf St Vincent about 74 kilometres southwest of the state capital of Adelaide and about 8 kilometres (5.0 mi) southeast by east of Edithburgh on Yorke Peninsula.
Jones Island is an island in the Australian state of South Australia located at the mouth of Baird Bay in the north end of Anxious Bay about 45 kilometres south-southeast of the town of Streaky Bay on the west coast of Eyre Peninsula. The island is notable as a breeding site for Australian sea lions and Australian pelicans. The island has enjoyed protected area status since 1967 and as of 1972, it has been part of the Baird Bay Islands Conservation Park.
Dorothee Island is an island in the Australian state of South Australia which is part of the Pearson Isles which itself is part of the larger island grouping known as the Investigator Group. It is located about 69 kilometres west south-west of Cape Finniss on the west coast of Eyre Peninsula. It was discovered as part of the Pearson Isles by Matthew Flinders on 13 February 1802. The island was given its name in August 1969 in order to preserve a name used within the locality by the Baudin expedition. The island has enjoyed protected area status since at least 1972 and since 2011, it been part of the Investigator Group Wilderness Protection Area.
Pearson Island is an island located in the Australian state of South Australia within the Pearson Isles an island group located in the larger group known as the Investigator Group about 63 kilometres southwest by west of Cape Finniss on the west coast of Eyre Peninsula. The group was discovered and named by Matthew Flinders on 13 February 1802. The island group has enjoyed protected area status since the 1960s and since 2011, it has been part of the Investigator Group Wilderness Protection Area. Pearson Island is notable both for its colony of Pearson Island Rock wallaby and for being a destination for scientific research.
Royston Island is an island in the Australian state of South Australia at the northern end of Pondalowie Bay on the south-west extremity of Yorke Peninsula about 13 kilometres north-west of the town of Stenhouse Bay. The island has enjoyed protected area status since 1967 and since 1972, it has been part of the Innes National Park.