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The Cumberland Plain, also known as Cumberland Basin, is a relatively flat region lying to the west of Sydney CBD in New South Wales, Australia. An IBRA biogeographic region, Cumberland Basin is the preferred physiographic and geological term for the low-lying plain of the Permian-Triassic Sydney Basin found between Sydney and the Blue Mountains, and it is a structural sub-basin of the Sydney Basin.
The Cumberland Plain has an area of roughly , which lies on Triassic and . Shaping the geography of Sydney, it extends from north of Windsor in the north, to Picton in the south; and from the Nepean-Hawkesbury River in the west almost to Sydney City, and includes parts of the Inner West and Northern Suburbs in the east. Much of the Sydney metropolitan area is located on the Plain. The Hornsby Plateau is located to the north and is dissected by steep valleys.
The plain takes its name from Cumberland County, in which it is situated, one of the cadastral land divisions of New South Wales. The name Cumberland was conferred on the County by Governor Arthur Phillip in honour of Ernest Augustus, Duke of Cumberland. Being the most populous region in Australia, the Cumberland Plain is one of the fastest-growing areas of the country in terms of population and it is home to a variety of Australian animal species, which are observable in the urban environments.
The Cumberland Plain is separated by the more hilly areas that fall into other Sydney regions such as Sydney CBD (in the City of Sydney), North Shore, Northern Beaches, Eastern Suburbs, Southern Sydney (including Sutherland Shire), Hills District, Hornsby Shire and the Forest District, which areas that border the Cumberland Plain.
The region mostly consists of low rolling hills and wide valleys in a rain shadow area near the Blue Mountains. The annual rainfall of the plain is typically around 700–900 mm, and is generally lower than the elevated terrain that partially surrounds it. Common vegetation in the Cumberland Plain is eucalyptus trees. The sclerophyll woodlands are situated on a nutrient-poor alluvium deposited by the Nepean River from sandstone and shale bedrock in the Blue Mountains. Despite this, they support a tremendous regional biodiversity. Cleared and used first for agriculture and then for urban development, most of the ecological communities that originally flourished on the plain are now considered endangered.NPWS (2002a) Native Vegetation of the Cumberland Plain – Final Edition, NPWS, Sydney.
To the south, the Cumberland Basin's topography is closely linked to the development of the Camden Syncline, which was active in the late Permian to the Middle Triassic period. The Botany Bay, which would have started to settle since the Oligocene, sits within this Lachlan Transverse Zone, which hints that this area of the Basin would have already existed at this stage. During the Cenozoic period, the Penrith and Botany basins may have acted as the Cumberland Basin's drainage, thereby explicating the incomprehensible activity of rivers within the area. Despite much study, especially along the western side at the Lapstone monocline, this complex matter is still not fully understood. There are volcanic rocks from low hills in the shale landscapes. Swamps and lagoons are existent on the floodplain of the Nepean River.
The Wianamatta Plain, with many undulating hills of Wianamatta Shale shales and sandstones, bounded by the Woronora and Illawarra Plateaus to the south, the Blue Mountains Plateau to the west and the Hornsby Plateau to the north/northeast. At the front of the Blue Mountains Plateau runs the Lapstone Structural Complex, which forms the western edge of the Cumberland Basin and Cumberland Plain. This is a north-south trending collection of reverse faults and monoclinal folds which extends generally north south for over . At the opposite side of the Cumberland Plain the Hornsby Plateau is fronted by the Hornsby Warp. That warp is topographically subtle in comparison to the Lapstone Structural Complex, and it is a feature which is poorly defined and inadequately defined in literature.
The Prospect dolerite intrusion in western Sydney is the largest assemblage of igneous rock in the Plain. The oval-shaped ridge was made many millions of years ago when volcanic material from the Earth's core actuated upwards and then sideways. Slow erosion of the overlying layers of sedimentary rock by the flow of have eventually laid bare the edges of the Volcanic rock and metamorphic rocks of the intrusion. The Western Sydney lie on the relatively flat, lowly elevated parts of the Cumberland Plain. Though there are a few hilly or relatively elevated regions on the plain. Western Sydney Parklands and the surrounding suburbs (such as Cecil Hills and Horsley Park), for instance, lie on a prominent ridge that is between high.
Bringelly Shale and Minchinbury Sandstone are often seen in the Plain's west. Ashfield Shale is observed in the inner western suburbs. These components are part of the Wianamatta Shale group.
Red and brown and soils, earthy sands, occur on crests and upper slopes in the Canterbury-Bankstown region and as well as in Fairfield City Council, which grade into yellow podzolics in depressions and drainage lines, and feature low soil fertility and poor drainage. Deep yellow podzolics occur on the alluvial floodplains near the Georges and Duck Rivers. The shale plains of the Cumberland Plain Woodland feature shale-influenced, nutrient-poor, reddish, sandy-clay soils that support components of ironstone gravels.
The south and southwest of Sydney is drained by the Georges River, flowing north from its source near Appin, towards Liverpool and then turning east towards Botany Bay. The other major tributary of Botany Bay is the Cooks River, running through the inner-south western suburbs of Canterbury and Tempe. The Georges River estuary separates the main part of Sydney's urban area from the Sutherland Shire. The Woronora River, on the southern edge of the Sydney Plain, flows in a steep-sided valley from the Woronora Dam to the eastern estuary of the Georges River.
Minor waterways draining Sydney's western suburbs include South Creek and Eastern Creek, flowing into the Hawkesbury, and Prospect Creek draining into the Georges River.
In 1820s, Peter Cunningham described the country west of Parramatta and Liverpool as "a fine timbered country, perfectly clear of The bush, through which you might, generally speaking, drive a gig in all directions, without any impediment in the shape of rocks, Scrubland, or close forest". This confirmed earlier accounts by Governor Arthur Phillip, who suggested that the trees were "growing at a distance of some twenty to forty feet from each other, and in general entirely free from brushwood..."
About 40 species of reptiles are found in the Cumberland Plain. 30 bird species exist in the urban areas, with the common ones being the Australian magpie, Australian raven, noisy miner and the pied currawong. Introduced birds include the common mynah, common starling and the house sparrow.
14 mammal species are widespread in the plain, with common species being those of and Phalangeriformes. The outskirts of the Cumberland Plain, such as those adjacent to large parks, have a great diversity of wildlife.
The Western Sydney Dry Rainforest is oftentimes found in sheltered gullies within the Cumberland Plain woodland, where it was originally 1,282 ha in size, but now only 338 ha remains. On the eastern peripheries of the plain, Shale Plains Woodland morphs into Turpentine-Ironbark Forest where the annual rainfall surpasses 950 mm. Rising to the Hornsby Plateau, the Turpentine-Ironbark Forest transitions into Blue Gum High Forest where the precipitation is above 1050 mm. Three discrete communities are acknowledged on margins of the plain, which are Shale Sandstone Transition Forest, High Sandstone Influence sub-communities and the Turpentine-Ironbark Margin Forest, which is present on the bounds of the Hornsby Plateau and . Four communities were found on two isolated alluvial deposits in the northwest (Castlereagh) and southeast (Holsworthy) corners of the plain. These were, Cooks River/Castlereagh Ironbark Forest at 1,012 ha, which occur on soils with a high clay content, and Castlereagh Scribbly Gum Woodland being more common on sandy loam soils. Recovering bushland on the Cumberland Plain Department of Environment and Conservation (NSW). (2005). Recovering Bushland on the Cumberland Plain: Best practice guidelines for the management and restoration of bushland. Department of Environment and Conservation (NSW), Sydney. Retrieved 12 September 2022.
Castlereagh Swamp Woodland is found in poorly drained slumps in the Holsworthy and Castlereagh areas. Wind-blown deposits in the section of Agnes Banks support a defined assemblage of hard-leaved species known as Agnes Banks Woodland, at 615 ha. On the margins of the alluvial sedimentation, Castlereagh Ironbark Forest transitions into Shale Gravel Transition Forest on separated alluvium superimposed on Wianamatta Shale, which is currently at 1,721 ha. The scarcest community on the Cumberland Plain is Elderslie Banksia Scrub Forest, at 13.4 ha, which is present on the deep sand deposition of the old alluvial rows of the Nepean River near Camden, where it morphs with Cumberland Plain Woodland and Sydney Coastal Riverflat Forest. The Riparian Forest, such as Coastal Swamp Oak Forest, is restricted to streams and adjoining swampy areas, and is closely related to Castlereagh Swamp Woodland when it comes to the floral species. Furthermore, Alluvial Woodland occurs on large more than 100 metres away from a river, where they transition into Shale Plains Woodland.
Apart from these aforementioned woodland communities, another 11 vegetation communities are found scattered on the Cumberland Plain:
The four nationally defined and protected threatened ecological communities are: Blue Gum High Forest of the Sydney Basin Bioregion; Cumberland Plain Shale Woodlands and Shale-Gravel Transition Forest; Shale/Sandstone Transition Forest; Turpentine-Ironbark Forest in the Sydney Basin Bioregion; and Western Sydney Sclerophyll and Moist Woodland on Shale. The plain has 300 different native plants and is home to over 20 threatened bird and animals.NPWS (2002b) Interpretation Guidelines for the Native Vegetation Maps of the Cumberland Plain, Western Sydney, Final Edition, NPWS, Sydney.
Cumberland Plain communities are protected in a number of council reserves, plus the Lower Prospect Canal Reserve, Scheyville National Park, Windsor Downs Nature Reserve, Leacock Regional Park and Mulgoa Nature Reserve and Mount Annan Botanic Garden. Cumberland Plain Woodland, of which around six per cent remains in isolated stands, was the first Australian ecological community to be assigned this status.
Furthermore, Abbotsbury, Cecil Hills and Glenmore Park were farms through until the 1980s when it was decided to redevelop them for housing. The area around the site of Regentville has remained largely rural, if hemmed in somewhat by the modern residential suburbs of Jamisontown and Glenmore Park.
In the 1800s, John Blaxland built an original wooden weir at "Grove Farm" (now known as Wallacia) for a sandstone flour mill and additional brewery. The land was also used for wheat farming until 1861 when wheat rust infected the entire crop. The rural regions were chiefly one of dairying and grazing during the 19th century, but in the early 20th century – because of its rural atmosphere and proximity to Sydney – tourism developed as people opened their homes as guest houses. Today, the rural areas include a number of orchards and vineyards in the . Vegetable farming and fruit picking are common activities.
(2026). 9780731810314, Kangaroo Press. ISBN 9780731810314
Soils
The moderately fertile soils in the plain are usually red and yellow in texture due to their clay-rich nature, where they turn coarser and are sometimes affected by salt in confluent valley floors. Red to brown are found on . Poor rocky soils, frequently on older , and high quality are present on contemporary floodplain alluvium.
Rivers
Rivers in the Cumberland Plain are prominent. The Nepean River rises to the south in the Woronora Plateau, and wraps around the western edge of the city. Parramatta River's headwaters are several local creeks including Toongabbie Creek and Hunts Creek, part of the upper Parramatta river catchment area. Hunt's creek flows from Lake Parramatta, a few kilometres North of Parramatta. Warragamba River flows north-east from the Warragamba Dam spillway to its confluence with the Nepean River.
Ecology
Flora
The most predominant vegetation in the Cumberland Plain are grassy sclerophyll (or savannas), with over 830 native species. Dry and wet sclerophyll forests generally lie on the Hornsby plateau, an elevated region north of the Plain. Dry sclerophyll forests contain which are usually in open woodlands that have dry shrubs and sparse grass in the understory. Only 12% of the original vegetation remains.
Fauna
The Cumberland Plain is home to a variety of bird, insect, reptile and mammal species, including . Arachnid, amphibian and crustacean species are also present. (2026). 9780643067493, CSIRO on behalf of the Department of the Environment and Heritage. . ISBN 9780643067493
Vegetation communities
Cumberland Plain features three main plant communities:Tozer M. (2003). ‘The native vegetation of the Cumberland Plain, western Sydney: systematic classification and field identification of communities’. Cunninghamia. 8, 1: 1–75.
Protection
Under Federal environmental legislation, six of the above ecological communities are protected as four "matters of national environmental significance". Some are grouped together into broader communities that share similarities in landscape position, structure and/or species.
Agriculture
The western portion of the Cumberland Plain mainly consists of sparsely populated, vast, rural with undulating hills and scenic vistas. The Sydney western suburbs of Mount Vernon, Kemps Creek, Orchard Hills, Luddenham, Mulgoa, Bringelly, Silverdale and Horsley Park, among others, lie in this agricultural countryside, adjacent to the footsteps of the Blue Mountains westwards of these country plains.Australian Heritage Commission (1981). 9780333337509, South Melbourne The Macmillan Company of Australia in association with the Australian Heritage Commission. . ISBN 9780333337509
See also
External links
(2011). 9781742328089, Department of Environment, Climate Change and Water (NSW). . ISBN 9781742328089
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