linguistic:paraphrasing
Geography

Adelaide is north of the Fleurieu Peninsula, on the Adelaide Plains between the Gulf St Vincent and the low-lying Mount Lofty Ranges. The city stretches 20 km (12 mi) from the coast to the foothills, and 90 km (56 mi) from Gawler at its northern extent to Sellicks Beach in the south. According to the Regional Development Australia, an Australian government planning initiative, the "Adelaide Metropolitan Region" has a total land area of 870 km (340 sq mi), while a more expansive definition by the Australian Bureau of Statistics defines a "Greater Adelaide" statistical area totalling 3,259.8 km (1,258.6 sq mi). The city sits at an average elevation of 50 metres (160 ft) above sea level. Mount Lofty, east of the Adelaide metropolitan region in the Adelaide Hills at an elevation of 727 metres (2,385 ft), is the tallest point of the city and in the state south of Burra. The city borders the Temperate Grassland of South Australia in the east, an endangered vegetation community.

Much of Adelaide was bushland before British settlement, with some variation – sandhills, swamps and marshlands were prevalent around the coast. The loss of the sandhills to urban development had a particularly destructive effect on the coastline due to erosion. Where practical, the government has implemented programs to rebuild and vegetate sandhills at several of Adelaide's beachside suburbs. Tennyson Dunes is the largest contiguous, tertiary dune system contained entirely within Metropolitan Adelaide, providing refuge for a variety of remnant species formerly found along the entire coastline. Much of the original vegetation has been cleared with what is left to be found in reserves such as the Cleland National Park and Belair National Park. A number of creeks and rivers flow through the Adelaide region. The largest are the Torrens and Onkaparinga catchments. Adelaide relies on its many reservoirs for water supply with the Happy Valley Reservoir supplying around 40% and the much larger Mount Bold Reservoir 10% of Adelaide's domestic requirements respectively.