The Spencer Gulf is the westernmost of two large inlets on the southern coast of Australia, in the state of South Australia, facing the Great Australian Bight. The Gulf is 322 km (200 mi) long and 129 km (80 mi) wide at its mouth. The western shore of the Gulf is the Eyre Peninsula, while the eastern side is the Yorke Peninsula, which separates it from the smaller Gulf St Vincent. Its entrance was defined by Matthew Flinders as a line from Cape Catastrophe on Eyre Peninsula to Cape Spencer on Yorke Peninsula.
The largest towns on the gulf are Port Lincoln, Whyalla, Port Pirie, and Port Augusta. Smaller towns on the gulf include Tumby Bay, Port Neill, Arno Bay, Cowell, Port Germein, Port Broughton, Wallaroo, Port Hughes and Port Victoria.
The gulf was named Spencer's Gulph by Flinders on 20 March 1802, after George John Spencer, the 2nd Earl Spencer (an ancestor of Diana, Princess of Wales). Visiting at roughly the same time as Flinders, Nicholas Baudin named the area Golfe Bonaparte. While other names bestowed by Baudin persisted (like Fleurieu Peninsula), Spencer Gulf became the official name.
By the 1830s, the natural harbour of Port Lincoln had become the site of an unofficial settlement, due in part to its convenience as a base for whaling vessels – which had long operated in the Great Australian Bight. Prior to the selection of Adelaide, some consideration was given to Port Lincoln as the potential site of a capital city.
The land surrounding the gulf, consisting of the Eyre and Yorke Peninsulas, is the Eyre Yorke Block bioregion. This was originally wooded shrubland but has now mainly been cleared for agriculture. Many of South Australia's iconic marine species can be found on the shores and in the waters of Spencer Gulf.
The rocky inshore reef along the coast near Port Bonython and Point Lowly is a breeding ground for the Northern Spencer Gulf population of giant Australian cuttlefish. They are a favorite food of local bottlenose dolphins, who have developed sophisticated techniques for safely eating these creatures. The Upper Spencer Gulf is also known for its snapper and Yellowtail kingfish fishing. Great white sharks are sometimes seen in Spencer Gulf by fishermen, and shark cage diving and surface tours operate out of Port Lincoln.
A relic population of tiger pipefish (Filicampus tigris), a subtropical species is range limited to Northern Spencer Gulf.
Visiting southern right whales and humpback whales enter Spencer Gulf from June through to October, and can be seen as far north as Point Lowly and Port Augusta. New Zealand fur seals and Australian sea lions can be found in Southern Spencer Gulf, with occasional sightings occurring in Northern Spencer Gulf. Bottlenose dolphins can be seen in the gulf's waters year-round.
Breeding colonies of little penguins exist on islands in Spencer Gulf. The northernmost colonies are located at Lipson Island and Wardang Island. In 2004, the Wardang Island colony's population was approximately 8,000 penguins. Cape Barren geese and several species of cormorants also breed on islands in Spencer Gulf.
Spencer Gulf contains a number of inshore and offshore islands. These include (from north to south):
- Curlew Island (south of Port Augusta)
- Weeroona Island (north of Port Pirie)
- Shag Island (north of Port Broughton)
- Entrance Island (near Cowell)
- Bird Islands (near Wallaroo)
- Lipson Island (north of Tumby Bay)
- Tumby Island (south of Tumby Bay)
- Wardang Island & the Goose Island group (near Port Victoria)
- The Sir Joseph Banks Group (offshore from Tumby Bay)
- Louth Island & Rabbit Island (in Louth Bay)
- Boston Island (in Boston Bay)
- Grantham Island and Bicker Isles (in Proper Bay)
- Donington Island, Carcase Rock, Owen Island, Taylor Island, Grindal Island, Little Island, Lewis Island, Smith Island, Hopkins Island and Thistle Island (east of the Jussieu Peninsula).
- Middle Island, South Island and Royston Island (in Pondalowie Bay)
- Gambier Islands including Wedge Island (in the mouth of Spencer Gulf)
Port Development Proposals
Due to its proximity to many identified mineral deposits in South Australia's Far North, Eyre Peninsula and Braemar regions, there are multiple new port and harbor developments proposed for the region.
These include new or expanded facilities at (from north to south):
- Port Bonython - Port Bonython Bulk Commodities Export Facility - Spencer Gulf Port Link (proposed 2012)
- Whyalla - Inner harbour expansion - Arrium (completed 2013)
- Port Pirie - Possible expansion for trans-shipment of iron ore from the Braemar region (concept stage)
- Lucky Bay - Lucky Bay Common User Export Facility (harbour expansion) - SeaSA (proposed 2013, construction commenced 2014)
- Myponie Point - Possible port location for Braemar region mineral exports (concept stage)
- Cape Hardy - Iron Road Ltd (proposed 2013)
- Lipson Cove - Port Spencer (formerly known as Sheep Hill) - Centrex Metals Ltd (proposed 2011)
Seawater desalination plants
As of 2016, there are one reverse osmosis and one thermal seawater desalination plant drawing water from Spencer Gulf. Several others are planned. All currently or will produce water primarily or exclusively for industrial use. They are:
|Location||Company||Production capacity (GL/year)||Purpose||Status|
|Whyalla||Arrium||1.6||Whyalla steelworks industrial supply||Commissioned 2011, operating|
|Port Augusta||Sundrop Farms||3||Growing vegetables||Operational in October 2016|
|Point Lowly||BHP Billiton||100||Olympic Dam mine mineral processing||Approved 2011, not yet constructed|
|Lipson Cove||Centrex Metals Ltd||5-20||For iron ore slurry pipeline||Proposed 2013|
|Myponie Point||Braemar Alliance||20-50||For iron ore slurry pipeline||Concept stage|
Spencer Gulf in Film & Video
Reserves declared by the South Australian government
Spencer Gulf contains four aquatic reserves.
Blanche Harbour-Douglas Bank Aquatic Reserve which is located in west side of Spencer Gulf, north of Whyalla, was declared in 1980 ‘for fisheries management, protection of its mangrove-seagrass communities and associated fish nursery areas.’
Goose Island Aquatic Reserve which is located at Goose Island on the east side of Spencer Gulf near Port Victoria was declared in 1971 to provide ‘a conservation area where teaching institutions may conduct classes and scientific research on marine biology and ecology and to protect the habitat of the seal colony situated on White Rocks.’
Whyalla - Cowleds Landing Aquatic Reserve which is located in on the west side of Spencer Gulf, just south of Whyalla, was declared in 1980 to ‘protect the mangrove-seagrass communities and associated fish nursery areas.’
Yatala Harbour Upper Spencer Gulf Aquatic Reserve which is located in Yatala Harbour on the east side of Spencer Gulf, north of Port Pirie, was declared in 1980 for ‘the protection of its mangrove-seagrass communities and associated fish nursery areas.’
Spencer Gulf contains five marine parks, each with its own outer boundary and internal zoning. Fishing is prohibited with Sanctuary Zones, and detailed maps and GPS coordinates for the parks are available from the Government of South Australia's Department of Environment, Water & Natural Resources.
The marine parks within Spencer Gulf are (from north to south):
- Upper Spencer Gulf Marine Park
- Franklin Harbor Marine Park
- Eastern Spencer Gulf Marine Park
- Sir Joseph Banks Group Marine Park
- Southern Spencer Gulf Marine Park
A number of terrestrial reserves either adjoin Spencer Gulf at low water or are located on islands within the gulf. On the west coast of the gulf, from north to south, they are Munyaroo Conservation Park, Franklin Harbor Conservation Park, Lipson Island Conservation Park, Tumby Island Conservation Park, Sir Joseph Banks Group Conservation Park, Lincoln National Park and Memory Cove Wilderness Protection Area. On the east coast of the gulf, from north to south, they are Winninowie Conservation Park, Bird Islands Conservation Park, Goose Island Conservation Park, Leven Beach Conservation Park and Innes National Park. At the mouth of the gulf, the Gambier Islands Conservation Park is located within the Gambier Islands group.
Important Bird Areas
Three Important Bird Areas (IBAs) have been nominated by BirdLife International at locations in Spencer Gulf. The Spencer Gulf Important Bird Area lies along the north-eastern coast of the Gulf; it comprises a 460 square kilometres (180 sq mi) strip of coastal land consisting mainly of intertidal mudflats, mangroves and salt marshes. It was identified as an IBA by BirdLife International because of its importance for the conservation of waders, or shorebirds. The other two IBAs within Spencer Gulf are located in the Sir Joseph Banks Group and at Goose Island. Both sites contain breeding colonies of various island seabird species.
- The harbor of Port Broughton on the Eastern shore of Spencer Gulf
- Spencer Gulf seen from one of NASA's Satellites
- Moonta Bay Jetty on the Eastern shore of Spencer Gulf
|Wikimedia Commons has media related to Spencer Gulf.|
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- Sepia apama: the giant Australian cuttlefish
- Whyalla Cuttlefish
- Catch cuttlefish, drain off the ink, then fillet. Serves five (dolphins): Scientists stunned by mammals' elaborate culinary preparations
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