South Western Sydney in the context of Campbelltown, New South Wales

Macarthur is a region in the Outer South-West part of the Greater Sydney area, in the state of New South Wales, Australia. The region includes the local government areas of the City of Campbelltown, the Camden Council and the Wollondilly Shire. It covers an area of 3,067 square kilometres and has a population of close to 310,000 residents.

The region is bounded at the north by Glenfield; at the south by Yanderra; at the east by the town of Appin; and at the west by the hamlet Nattai.

Greater Western Sydney (GWS) is a large region of the metropolitan area of Greater Sydney, New South Wales (NSW), Australia that generally embraces the north-west, south-west, central-west, far western and the Blue Mountains sub-regions within Sydney's metropolitan area and encompasses 11 local government areas: Blacktown, Blue Mountains, Camden, Campbelltown, Cumberland, Fairfield, Hawkesbury, Liverpool, Parramatta, Penrith and Wollondilly. It includes Western Sydney, which has a number of different definitions, although the one consistently used is the region composed of ten local government authorities, most of which are members of the Western Sydney Regional Organisation of Councils (WSROC). The NSW Government's Office of Western Sydney calls the region "Greater Western Sydney".

Radiocarbon dating suggests human activity occurred in the Sydney metropolitan area from around 30,000 years ago. The Darug people lived in the area that was greater western Sydney before European settlement regarded the region as rich in food from the river and forests. Parramatta was founded in 1788, the same year as Sydney, making it the second oldest city in Australia. Opened in 1811, Parramatta Road, which navigates into the heart of greater western Sydney, is one of Sydney's oldest roads and Australia's first highway between two cities – Sydney central business district (CBD) and Parramatta, which is now the sixth largest business district in Australia. Rapid population increase after World War II saw the settlement of many ex-service men and migrants in the greater west, making it one of the most urbanised regions in the country and an area of growing national importance.

Liverpool is a city in South Western Sydney, in the state of New South Wales, Australia, 31 kilometres (19 mi) south-west of the Sydney CBD. It is the administrative seat of the City of Liverpool and is in the Cumberland Plain. Liverpool is currently the major city centre in South Western Sydney. The city centre has a Hoddle Grid layout with many little laneways and arcades, similar to that of Melbourne CBD. The northern end of the city has been zoned for high density residential apartments. The southern end of the city is zoned for high density commercial developments. Liverpool has a large teaching hospital, two technical colleges and many shopping centres and office buildings.

Glenfield is a suburb of Sydney, in the state of New South Wales, Australia. Glenfield is located 36 kilometres south-west of the Sydney central business district, in the local government area of the City of Campbelltown and is part of the Macarthur region.

The metropolis of Greater Sydney in New South Wales, Australia, is informally subdivided into a number of geographic regions. The geographical definition of Greater Sydney spans across 33 local government areas and includes the Blue Mountains in the west, the Northern Beaches and the Hawkesbury in the north, the Royal National Park, the Wollondilly and Macarthur in the south, and Botany Bay in the east. These areas sometimes, but not always, roughly coincide with official boundaries of suburbs, local government authorities, or cadastral units (used for land title purposes), and some of the customary regions do not have well defined boundaries at all. Some commonly referred to regions overlap: for example, Canterbury-Bankstown is often referred to as a region, but it is also part of the South Western Sydney region. The regions themselves are not used as a formal jurisdiction, and generally do not have administrative or legislative bodies, although some regions are coterminous with a local government area, and in a number of regions that include multiple local government areas, Regional Organisations of Councils have been established that represent the councils in the region.

For government planning purposes, the metropolis of Sydney is divided in other ways, including into "districts" or "cities".