Cumberland Plain in the context of Hornsby Plateau

Prospect Hill is a heritage-listed hill in Pemulwuy and Prospect in the greater western region of Sydney, New South Wales, Australia. Situated about 30 kilometres (19 miles) west of central Sydney, the hill is Sydney's largest body of igneous rock and is higher than the ridges of the Cumberland Plain around it, with its present-day highest point being 117 metres (384 feet) high, although before its summit was quarried away it rose to a height of 131 metres (430 feet) above sea level.

Prospect Hill is a free-standing hillock which is disconnected from Marrong Reserve to the south at a saddle by Butu Wargun Drive. Prospect Hill is a “nodal point” of the Cumberland Plain. Its summit affords a “goodly prospect” west to the Blue Mountains and east to the man-made landmarks of central Sydney. People have walked round and over Prospect Hill for 30,000 years and have recognised it as a landmark, a meeting place and a boundary. For today's Australians it has historic significance, aesthetic values and commercial values. Owned by Boral Limited and CSIRO, the site was added to the New South Wales State Heritage Register on 17 October 2003.

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.

Penrith is a city in New South Wales, Australia, located in Greater Western Sydney, 55 kilometres (31 mi) west of the Sydney central business district on the banks of the Nepean River, on the outskirts of the Cumberland Plain. Its elevation is 32 metres (105 ft).

Penrith is the administrative centre of the local government area of the City of Penrith.

Cumberland County, or the County of Cumberland, is a county in the State of New South Wales, Australia. Most of the Sydney metropolitan area is located within the County of Cumberland.

The County of Cumberland stretches from Broken Bay to the north, the Hawkesbury River to the north-west, the Nepean River to the west, the Cataract River to the south-west and the northern suburbs of Wollongong to the south. It includes the area of the Cumberland Plain.

Blacktown City Council is a local government area in Western Sydney, situated on the Cumberland Plain, approximately 35 kilometres (22 mi) west of the Sydney central business district, in the state of New South Wales, Australia. Established in 1906 as the Blacktown Shire and becoming the Municipality of Blacktown in 1961 before gaining city status in 1979, the City occupies an area of 246.9 square kilometres (95.3 sq mi) and has a population of 410,419, making it the most populous local government area in Sydney. It is a member council of the Hawkesbury River County Council.

The Mayor of Blacktown City Council is Councillor Brad Bunting following the death of then-mayor Tony Bleasdale OAM, a member of the Australian Labor Party who died 3 May 2024.

The City of Parramatta, also known as Parramatta Council, is a local government area located to the west and north-west of Sydney CBD in the Greater Western Sydney region. Parramatta Council is situated between the City of Ryde and Cumberland, where the Cumberland Plain meets the Hornsby Plateau, approximately 25 kilometres (16 mi) west of the Sydney central business district, in New South Wales, Australia. The city occupies an area of 84 square kilometres (32 sq mi) spanning across suburbs in Greater Western Sydney including the Hills District, and a small section of Northern Sydney to the far north east of its area. According to the 2021 census, City of Parramatta had an estimated population of 256,729. The city houses the Parramatta central business district which is one of the key suburban employment destinations for the region of Greater Western Sydney.