Gawler in the context of "Barossa Valley (wine)"

Adelaide (/ˈædɪleɪd/ AD-il-ayd; Kaurna: Tarndanya [ˈd̪̥aɳɖaɲa]) is the capital and most populous city of South Australia, as well as the fifth-most populous city in Australia. The name "Adelaide" may refer to either Greater Adelaide (including the Adelaide Hills) or the Adelaide city centre; the demonym Adelaidean is used to denote the city and the residents of Adelaide. The traditional owners of the Adelaide region are the Kaurna, with the name Tarndanya referring to the area of the city centre and surrounding Park Lands, in the Kaurna language. Adelaide is situated on the Adelaide Plains north of the Fleurieu Peninsula, between the Gulf St Vincent in the west and the Mount Lofty Ranges in the east. Its metropolitan area encompasses over 430 suburbs, extending 96 km (60 mi) from Gawler in the north to Sellicks Beach in the south and 20 km (12 mi) from the western coast to the eastern foothills of the Mount Lofty Ranges.

Named in honour of Adelaide of Saxe-Meiningen, wife of King William IV, the city was founded in 1836 as the planned capital for the only freely settled British province in Australia, distinguishing it from Australia's penal colonies. Colonel William Light, one of Adelaide's founding fathers, designed the city centre and chose its location close to the River Torrens. Light's design, now listed as national heritage, set out the city centre in a grid layout known as "Light's Vision", interspaced by wide boulevards and large public squares, and entirely surrounded by park lands. Colonial Adelaide was noted for its leading examples of religious freedom and progressive political reforms and became known as the "City of Churches" due to its diversity of faiths. It was Australia's third-most populous city until the postwar era.

Port Pirie is a small city on the east coast of the Spencer Gulf in South Australia, 223 km (139 mi) north of the state capital, Adelaide. Port Pirie is the largest city and the main retail centre of the Mid North region of South Australia. The city has an expansive history which dates back to 1845. Port Pirie was the first proclaimed regional city in South Australia, and is currently the second most important and second busiest port in SA.

At the 2021 Census, Port Pirie had a population of 13,896. Port Pirie is the eighth most populous city in South Australia after Adelaide, Mount Gambier, Gawler, Mount Barker, Whyalla, Murray Bridge and Port Lincoln.

Whyalla /waɪˈælə/ is a city in South Australia. It was founded as Hummock's Hill, and was known by that name until 1916. It is the fourth most populous city in the Australian state of South Australia after Adelaide, Mount Gambier, and Gawler, and along with Port Pirie and Port Augusta is one of the three towns to make up the "Iron Triangle". It is a seaport located on the east coast of the Eyre Peninsula and is known as the "Steel City" due to its integrated steelworks and shipbuilding heritage. The Whyalla Steelworks is the major employer in the town, and has in February 2025 been put into voluntary administration by the Government of South Australia. The port of Whyalla has been exporting iron ore since 1903.

The North–South Corridor is a series of component motorways travelling through Adelaide, South Australia that will eventually form a continuous link from Old Noarlunga in the outer southern metropolitan Adelaide suburbs through to Gawler in northern metropolitan Adelaide, comprising a distance of 78km. Under South Australia's road route system, the corridor is signed as route M2.

Comprising the Northern Expressway, the North–South Motorway and the Southern Expressway, parts of the corridor are still under construction or planning, with the project aiming for completion by 2031.