An islet ( / ˈ aɪ l ə t / EYE -lət ) is generally a small island . Definitions vary, and are not precise, but some suggest that an islet is a very small, often unnamed, island with little or no vegetation to support human habitation . It may be made of rock, sand and/or hard coral ; may be permanent or tidal (i.e. surfaced reef or seamount ); and may exist in the sea , lakes , rivers or any other sizeable bodies of water .
14-635: Hogan Island , the largest island of the Hogan Group , is a 232-hectare (570-acre) granite island , located in northern Bass Strait , that lies between the Furneaux Group in north-east Tasmania , and Wilsons Promontory in Victoria , Australia. The island has a maximum elevation of 116 metres (381 ft) AHD . Together with the other islands in the Hogan, Kent and Furneaux groups, Hogan Island formed part of
28-626: A land bridge that connected Tasmania to mainland Australia until the end of the Pleistocene period. After the glacial period ended, the Hogan Group were the first islands to become isolated by rising sea levels . The islands were named in 1802 by John Black , captain of the brig Harbinger , after Michael Hogan , the owner of his ship. The Harbinger was the first vessel to sail through Bass Strait after its discovery by Bass and Flinders . From that time, sealers inhabited, or regularly visited,
42-735: Is considered a rock or not, it can have significant economic consequences under Article 121 of the UN Convention on the Law of the Sea , which stipulates that "Rocks which cannot sustain human habitation or economic life of their own shall have no exclusive economic zone or continental shelf ." One long-term dispute over the status of such an islet was that of Snake Island (Black Sea) . The International Court of Justice jurisprudence however sometimes ignores islets, regardless of inhabitation status, in deciding territorial disputes; it did so in 2009 in adjudicating
56-456: Is moderately low (averaging 619.6 mm (24.39 in) per annum), but rainfall is frequent, as Hogan Island receives 157.2 precipitation days annually (with a maximum frequency of rain in winter ). Extreme temperatures have ranged from 39.3 °C (102.7 °F) on 29 January 2009 to 2.2 °C (36.0 °F) on 5 September 2017. Recorded breeding seabird and wader species include little penguin , short-tailed shearwater also known as
70-469: The Bass Strait. The islands are made up of grey and red granite and limestone. A group of fur seals live on Boundary Islet. Other plants and animals that live on and near the island group include Cystophora intermedia , eelgrass , kelp, and abalone . During the Pleistocene period, the Hogan Group was part of a land bridge that connected Tasmania to mainland Australia. After the glacial period ended,
84-422: The Hogan Group were the first group of islands to become isolated by rising sea levels . The Hogan Group was discovered by Europeans and named in 1801 by John Black , captain of the brig Harbinger , who named the island group after Michael Hogan , the owner of his ship. There are records of settlers on the island group, who hunted seals and kangaroos and used the islands for grazing land. On 12 October 1900,
98-596: The first lease was recorded and given for Hogan Island. While the original lease covered the entire island group, since 1959 the lease has only applied to Hogan Island, which has been leased by B.R. Stackhouse since 1967, who uses the island for sheep and cattle grazing. Black erred in his initial survey, placing the group further north than they actually are, which led to the Victoria-Tasmania land border on Boundary Islet. Islet As suggested by its origin islette , an Old French diminutive of "isle", use of
112-455: The islands. After the mass killing of seals made sealing less viable, sealers turned to hunting kangaroos or farming. On 12 October 1900, the first lease for Hogan Island was recorded. While the original lease covered the entire island group, since 1959 it has only applied to Hogan Island and, from 1967, was held by B. R. Stackhouse, who used the island for cattle and sheep grazing. However, that activity ceased after causing considerable damage to
126-470: The muttonbird, Pacific gull , silver gull and sooty oystercatcher . Reptiles present are the eastern blue-tongued lizard , metallic skink , three-lined skink , Bougainville's skink and White's skink . Feral goats were present for some time also. The state border between Tasmania and Victoria lies in the Hogan Group and passes over land on the North East Islet, thus giving a land border between
140-707: The states of Tasmania and Victoria . The island group is officially designated unallocated Crown land , within the Flinders Municipality in Tasmania and the South Gippsland Shire in Victoria. The Hogan Group comprises the Hogan Island , Twin , Long , Round , East , Boundary (or North East) islets, and Seal Rock . The Hogan Group is located 40 kilometres (25 mi) southeast of Wilsons Promontory in
154-420: The term implies small size, but little attention is given to drawing an upper limit on its applicability. The World Landforms website says, "An islet landform is generally considered to be a rock or small island that has little vegetation and cannot sustain human habitation", and further that size may vary from a few square feet to several square miles, with no specific rule pertaining to size. Whether an islet
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#1732890496756168-428: The two states. Before Victoria became a colony, it was agreed that New South Wales would have the sovereignty of all the land to Bass Strait, and Tasmania would have Bass Strait, except for waters near the coast. The original intention was that these Bass Strait Islands would be part of Tasmania, but the surveyed position for Wilson's Promontory was slightly off, and the border placed too far south at 39°12' S. Once this
182-753: The vegetation and the natural springs there. Hogan Island possesses an oceanic climate ( Köppen: Cfb), with tepid summers and mild winters. Temperatures are moderated by its position in the Bass Strait and from frequent westerlies in all seasons. Average maxima vary from 21.8 °C (71.2 °F) in January to 13.0 °C (55.4 °F) in July, while average minima fluctuate between 15.3 °C (59.5 °F) in February and 8.8 °C (47.8 °F) in August. Mean precipitation
196-459: Was discovered the Islet was renamed to Boundary Islet . The land border is 85 metres (279 ft) long. Hogan Group The Hogan Group is a collection of six (to eight ) islands and islets located in the Bass Strait that define part of the border between mainland Australia and the island state of Tasmania . Within the jurisdiction of Tasmania, the Hogan Group forms a land border between
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