On the east. The western limit of theTasman Sea betweenGabo Island and Eddystone Point [being a line from Gabo Island (nearCape Howe, 37°30'S) to the northeast point of East Sister Island (148°E) thence along the148th meridian toFlinders Island; beyond this Island a line running to the Eastward of the Vansittart Shoals to [Cape]Barren Island, and from Cape Barren (the easternmost point of [Cape] Barren Island) to Eddystone Point (41°S) [in Tasmania].
Monument commemorating the first flight across the Bass Strait, byArthur Leonard Long in 1919. Note the spelling "Straits".
Some authorities consider the strait to be part of the Pacific Ocean[2] as in the never-approved 2002 IHOLimits of Oceans and Seas draft. In the currently in-force IHO 1953 draft, it is instead associated with the Great Australian Bight; the Bight is numbered 62, while the Bass Strait is designated 62-A.[1]
The shoreline of Tasmania and Victoria about 14,000 years ago as sea levels were rising, showing some of the human archaeological sites – seePrehistory of Australia
Aboriginal Tasmanians arrived in Tasmania approximately 40,000 years ago during thelast glacial period, across a broad prehistoricland bridge called theBassian Plain between the nowaday southern Victoria coastline (fromWilsons Promontory toCape Otway) and the northern Tasmanian shores (fromCape Portland toCape Grim).[4] After the glacial period ended, sea levels rose and flooded the Bassian Plain to form Bass Strait at around 8,000 years ago, leaving them isolated from the Australian mainland. Aboriginal people lived onFlinders Island until around 4,000 years ago.
Based on the recorded language groups, there were at least three successive waves of Aboriginal colonisation.
The strait was possibly detected by CaptainAbel Tasman when he charted Tasmania's coast in 1642. On 5 December Tasman was following the east coast northward to see how far it went. When the land veered to the north-west atEddystone Point,[5] he tried to keep in with it but his ships were suddenly hit by theRoaring Forties howling through Bass Strait.[6] Tasman was on a mission to find the Southern Continent, not more islands, so he abruptly turned away to the east and continued his continent hunting.[7]
The next European to approach the strait was CaptainJames Cook inHMS Endeavour in April 1770. However, after sailing for two hours westward towards the strait against the wind, he turned back east and noted in his journal that he was "doubtful whether they [i.e. Van Diemen's Land and New Holland] are one land or no".[8]
The strait was named afterGeorge Bass, after he andMatthew Flinders sailed across it while circumnavigatingVan Diemen's Land (now namedTasmania) in theNorfolk in 1798–99. At Flinders' recommendation, the Governor of New South Wales,John Hunter, in 1800 named the stretch of water between the mainland and Van Diemen's Land "Bass's Straits".[9] In 1798 it became known as Bass Strait.[10]
The existence of the strait had been suggested in 1797 by the master ofSydney Cove when he reached Sydney after deliberately grounding his foundering ship and being stranded onPreservation Island (at the eastern end of the strait). He reported that the strong south westerly swell and the tides and currents suggested that the island was in a channel linking the Pacific and southern Indian Ocean. Governor Hunter thus wrote toJoseph Banks in August 1797 that it seemed certain a strait existed.[11]
When news of the 1798 discovery of Bass Strait reached Europe, the French government despatched a reconnaissance expedition commanded byNicolas Baudin. This promptedGovernor King to send two vessels from Sydney to the island to establish a garrison at Hobart.[12]
Strong currents between the Antarctic-driven southeast portions of the Indian Ocean and theTasman Sea's Pacific Ocean waters provide a strait of powerful, wild storm waves. The shipwrecks on the Tasmanian and Victorian coastlines number in the hundreds, although stronger metal ships and modern marinenavigation have greatly reduced the danger.
Many vessels, some quite large, have disappeared without a trace, or left scant evidence of their passing. Despite myths and legends ofpiracy,wrecking and alleged supernatural phenomena akin to those of theBermuda Triangle, such disappearances can be invariably ascribed to treacherous combinations of wind and sea conditions, and the numerous semi-submerged rocks and reefs within the Straits.[13]
Despite the strait's difficult waters, it provided a safer and less boisterous[clarification needed] passage for ships on the route from Europe or India to Sydney in the early 19th century. The strait also saved 1,300 km (700 nmi) on the voyage.[11]
Shortest distance between the coasts of Bass Strait: South West Point on Wilsons Promontory to the northern tip of theStanley peninsula
Bass Strait is approximately 250 km (160 mi) wide and 500 km (310 mi) long, with an average depth of 60 m (200 ft). The widest opening is about 350 km (220 mi) between Cape Portland on the northeastern tip of Tasmania andPoint Hicks on the Australian mainland.
Jennings' study of the submarine topography of Bass Strait[14] described the bathymetric Bass Basin, a shallow depression approximately 120 km (70 mi) wide and 400 km (250 mi) long (over 65,000 km2 [25,000 sq mi] in area) in the centre of Bass Strait, a maximum depth is the channel betweenInner Sister Island andFlinders Island, which navigation charts indicate reaches 155 m (510 ft). Twounderwater plateaus, theBassian Rise andKing Island Rise located on the eastern and western margins of Bass Strait, respectively, are composed of a basement ofPaleozoicgranite. These features formsills separating Bass Basin from the adjacent ocean basins. Associated with the less than 50 m (160 ft)-deep Bassian Rise is theFurneaux Islands, the largest of which is Flinders Island (maximum elevation 760 m [2,490 ft]). The surface of the King Island Rise also occurs in water depths of less than 50 m (160 ft), and includes the shallow (40 m [130 ft])Tail Bank at its northern margin as well asKing Island itself.Subaqueous dunes (sandwaves) andtidal current ridges cover approximately 6,000 km2 (2,300 sq mi) of the seabed in Bass Strait.[15]
DuringPleistocene, low sea level stands the central basin of Bass Strait was enclosed by raised sills forming a large shallow lake. This occurred during thelast glacial maximum (18,000 BP) when the basin was completely isolated. Sea level rise during the marine transgression flooded the basin, forming a westwardembayment from 11,800 BP to 8700 BP, and the basin rim was completely flooded by about 8000 BP, at which point Bass Strait was formed and Tasmania became an isolated island.[16]
Like the rest of the waters surrounding Tasmania, and particularly because of its limited depth, it is notoriously rough, with manyships lost there during the 19th century. Alighthouse was erected onDeal Island in 1848 to assist ships navigating in the eastern part of the Straits, but there were no guides to the western entrance until theCape Otway Lighthouse was first lit in 1848, followed by another atCape Wickham at the northern end of King Island in 1861.
Within Bass Strait there are severalCommonwealth marine reserves, which are all part of the South-east Network. The two larger reserves, Flinders and Zeehan, extend mostly outside of the Bass Strait area.
The smaller islands of Bass Strait typically have some form of protection status. Most notably theKent Group National Park covers theKent Group islands of Tasmania, as well as the surrounding state waters which is a dedicated marine reserve. The national park is wholly contained by the Beagle Commonwealth Marine Reserve.
Victoria has several marine national parks in Bass Strait, and are all adjacent to the mainland coastline:
A number of oil and gas fields exist in the eastern portion of Bass Strait, in what is known as the Gippsland Basin. Most large fields were discovered in the 1960s, and are located about 50 to 65 km (30 to 40 mi) off the coast ofGippsland in water depths of about 70 m (230 ft).[17]: 484 These oil fields include the Halibut Field discovered in 1967, the Cobia Field discovered in 1972, the Kingfish Field, the Mackerel Field, and the Fortescue Field discovered in 1978.[17]: 484 Large gas fields include the Whiptail field, the Barracouta Field, the Snapper Field, and the Marlin Field.[17]: 484 Oil and gas are produced from theCretaceous-Eoceneclastic rocks of the Latrobe Group, deposited with the break-up of Australia and Antarctica.[17]: 485 In 2020 activist group No Gas Across the Bass was set up after American companyConocoPhillips put in an application to seismic blast 27km fromKing Island. Further environmental campaigning followed the Australian government's 2020 Oil and Gas acreage release as this opened up new areas of Tasmania's oceans for exploration.[18]
The western field, known as theOtway Basin, was discovered in the 1990s offshore nearPort Campbell. Its exploitation began in 2005.
In June 2017, theGovernment of Victoria announced a three-year feasibility study[19] for Australia's firstoffshore wind farm. The project, which could have 250wind turbines within a 574 km2 (222 sq mi) area, is projected to deliver around 8,000 GWh of electricity, representing some 18 per cent of Victoria's power usage and replacing a large part of the output ofHazelwood Power Station, which was closed in early 2017.
The domestic sea route is serviced by twoSpirit of Tasmania passenger vehicleferries, based inDevonport, Tasmania. The ships travel daily between Devonport and Spirit of Tasmania Quay inGeelong as overnight trips, with additional daytime trips during the peak summer season.[20]
TheBasslinkHVDC electrical cable has been in service since 2006. It has the capacity to carry up to 630megawatts of electrical power across the strait.
Alinta owns a submarinegas pipeline, delivering natural gas to large industrial customers nearGeorge Town, as well as thePowerco gas network in Tasmania.
Tasmania is currently connected to the mainland via twoTelstra-operated fibre optic cables; since 2006,dark fibre capacity has also been available on the Basslink HVDC cable.
In 1978, one of the most famousUFO incidents in Australian history occurred over Bass Strait.Frederick Valentich was flying a small aeroplane over the strait when he reported to personnel at a local airport that a strange object was buzzing his plane. He then claimed that the object had moved directly in front of his plane; the airport personnel then heard a metallic "scraping" sound, followed by silence. Valentich and his plane subsequently vanished and neither Valentich nor his plane were ever seen again.
The issue of planes, ships and people having been lost in the strait over time has spawned a number of theories. Perhaps the most thorough list of losses and disappearances has been the oft reprinted book of Jack Loney[23] though it is possible that most losses can be adequately explained by extreme weather events.[24]
On the popular Australian soapNeighbours, one of its most dramatic storylines unfolded when a 1940s themed joy flight to Tasmania was sabotaged by a bomb.The plane crashed into Bass Strait in the middle of the night and many character's lives were put at risk, with some drowning.
The firstwindsurfer crossing was in 1982 by Mark Paul and Les Tokolyi.[25] In 1998 Australian offshore sailorNick Moloney took on a different challenge by being the first person to windsurf unaided across the Bass Strait in a time of 22 hours.[26]
In March 2009 two young dinghy sailors sailed aB14 (dinghy) from Stanley in north west Tasmania to Walkerville South in Victoria. The purpose of the voyage was to raise funds for the treatment of the endangeredTasmanian Devil, an animal species suffering from a facial tumour disease and, if possible, break the dinghy sailing time record for the crossing. The sailors Adrian Beswick and Josh Philips accompanied by a support vessel successfully completed the crossing in 14 hours 53 minutes.[28][29]
Kitesurfers have also completed the crossing[30][31] with Natalie Clark in 2010 become the first female to do the crossing.[32]
In 1971 lone rower David Bowen fromMount Martha crossed Bass Strait in a 6.1 m (20 ft)dory, leaving from Devonport he landed on Wilson's Promontory.[33]
The first crossing bypaddleboard was made by Jack Bark, Brad Gaul and Zeb Walsh, leavingWilsons Promontory in Victoria on 25 February 2014 and arriving atCape Portland in northeastern Tasmania on 4 March 2014.[34]
Rod Harris, Ian and Peter Richards are credited with the first kayak crossing in 1971. Many sea kayakers have since made the crossing, usually by island hopping on the eastern side of the strait.[35][36][37] Fewer sea kayak crossings have been made via King Island, due to the 100 km (60 mi) leg between Cape Wickam and Apollo Bay.Andrew McAuley was the first person to cross Bass Strait non-stop in asea kayak in 2003. He made two more crossings of Bass Strait before he died attempting to cross the Tasman Sea in February 2007.[38] In total, roughly 300 people have crossed bass strait by kayak in modern times.[citation needed]
^Schilder, Günter (1976).Australia unveiled : the share of the Dutch navigators in the discovery of Australia. Amsterdam: Theatrum Orbis Terrarum Ltd. p. 170.ISBN9022199975.
^Valentyn, Francois (1724–1726).Oud en nieuw Oost-Indien. Dordrecht: J. van Braam. p. vol.3, p.47.ISBN9789051942347.{{cite book}}:ISBN / Date incompatibility (help)
^Cameron-Ash, M. (2018).Lying for the Admiralty: Captain Cook's Endeavour Voyage. Sydney: Rosenberg. p. 105.ISBN978-0-64804-396-6.
^Beaglehole, J. C., ed. (1955).The Journals of Captain James Cook on his Voyage of Discovery, vol 1, the Voyage of the Endeavour, 1768–1771. Cambridge University Press, London. pp. 298–99 (18, 19 April 1770).
^Jennings, J. N. (1958). The submarine topography of Bass Strait. Proceedings of the Royal Society of Victoria, 71, 49–71.
^Malikides, M., Harris, P. T., Jenkins, C. J., & Keene, J. B. (1988). Carbonate sandwaves in Bass Strait. Australian Journal of Earth Science, 35, 303–311
^abcdHendrich, J.H., Palmer, I.D., and Schwebel, D.A., 1992, Fortescue Field, Gippsland Basin, Offshore Australia, In Giant Oil and Gas Fields of the Decade, 1978–1988, AAPG Memoir 54, Halbouty, M.T., editor, Tulsa: American Association of Petroleum Geologists,ISBN0891813330
Orchiston, D. Wayne; Glenie, R. C. (1978). "Residual Holocene Populations in Bassiania: Aboriginal Man at Palana, Northern Flinders Island".Australian Archaeology.8:127–141.doi:10.1080/03122417.1978.12093345.
