page_title: Sydney
section_title: Topography
hierarchical_section_title: Sydney / Geography / Topography
caption_attribution_description: English: This simulated true-colour Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image shows the Sydney metropolitan area on 12 October 2001 and covers an area of 42 by 33 kilometres. The image displays the concentrated development of the urban area. Observed by the Terra satellite.
context_page_description: Sydney is the state capital of New South Wales and the most populous city in Australia and Oceania. Located on Australia's east coast, the metropolis surrounds Port Jackson and extends about 70 km on its periphery towards the Blue Mountains to the west, Hawkesbury to the north, the Royal National Park to the south and Macarthur to the south-west. Sydney is made up of 658 suburbs, 40 local government areas and 15 contiguous regions. Residents of the city are known as "Sydneysiders". As of June 2019, Sydney's estimated metropolitan population was 5,312,163, meaning the city is home to approximately 65% of the state's population.
  Indigenous Australians have inhabited the Sydney area for at least 30,000 years, and thousands of engravings remain throughout the region, making it one of the richest in Australia in terms of Aboriginal archaeological sites. During his first Pacific voyage in 1770, Lieutenant James Cook and his crew became the first Europeans to chart the eastern coast of Australia, making landfall at Botany Bay and inspiring British interest in the area.
context_section_description: Sydney is a coastal basin with the Tasman Sea to the east, the Blue Mountains to the west, the Hawkesbury River to the north, and the Woronora Plateau to the south. The inner city measures 25 square kilometres (10 square miles), the Greater Sydney region covers 12,367 square kilometres (4,775 square miles), and the city's urban area is 1,687 square kilometres (651 square miles) in size. In terms of physical size, the Sydney metropolitan area is comparable to both Tokyo, at 13,452 square kilometres (5,194 square miles) and Los Angeles, at 12,559 square kilometres (4,849 square miles).
  Sydney spans two geographic regions. The Cumberland Plain lies to the south and west of the Harbour and is relatively flat. The Hornsby Plateau is located to the north and is dissected by steep valleys. The flat areas of the south were the first to be developed as the city grew. It was not until the construction of the Sydney Harbour Bridge that the northern reaches of the coast became more heavily populated. Seventy beaches can be found along its coastline with Bondi Beach being one of the most famous.
  The Nepean River wraps around the western edge of the city and becomes the Hawkesbury River before reaching Broken Bay. Most of Sydney's water storages can be found on tributaries of the Nepean River. The Parramatta River is mostly industrial and drains a large area of Sydney's western suburbs into Port Jackson. The southern parts of the city are drained by the Georges River and the Cooks River into Botany Bay.
caption: Sydney lies on a submergent coastline where the ocean level has risen to flood deep rias.
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