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Geography of Sydney

From Wikipedia, the free encyclopedia

 Satellite image of Sydney taken in 2007 with some of its prominent regions and suburbs labeled.
Satellite image of Sydney taken in 2007 with some of its prominent regions and suburbs labeled.

The geography of Sydney is characterised by its coastal location on a basin bordered by the Pacific Ocean to the east, the Blue Mountains to the west, the Hawkesbury River to the north and the Woronora Plateau to the south. Sydney lies on a submergent coastline on the east coast of New South Wales, where the ocean level has risen to flood deep river valleys (rias) carved in the Sydney sandstone. Port Jackson, better known as Sydney Harbour, is one such ria.[1]

The Sydney area lies on Triassic shales and sandstones. The region mostly consists of low rolling hills and wide valleys in a rain shadow area. Sydney sprawls over two major regions: the Cumberland Plain, a relatively flat region lying to the west of Sydney Harbour, and the Hornsby Plateau, a plateau north of the Harbour rising to 200 metres and dissected by steep valleys.[2] Sydney's native plant species are predominantly eucalyptus trees,[3] and its soils are usually red and yellow in texture. The endemic flora is home to a variety of bird, insect, reptile and mammal species, which are conspicuous in urban areas.[4]

There are more than 70 harbour and ocean beaches in the urban area. Most of Sydney's water storages are on tributaries of the Nepean River. Parramatta River drains a large area of Sydney's western suburbs.[5] With 5,005,400 inhabitants (as of 2016) and an urban population density of 2037 people per square kilometre, Sydney's urban area covers 1,788 km² (690 mi²),[6] comprising 35% of Sydney and is constantly growing.[7]

Geology

 The Sydney region includes coastal features of cliffs, beaches, estuaries and deep river valleys known as rias.
The Sydney region includes coastal features of cliffs, beaches, estuaries and deep river valleys known as rias.

The rising sea level between 18,000 and 6,000 years ago flooded the rias to form estuaries and deep harbours. Erosion by coastal streams has created a landscape of deep canyons and remnant plateaus.[8] The city has fault lines which run considerably deep beneath the Sydney basin, dating back to when New Zealand started breaking away from Australia more than 85 million years ago.[9][10] To the east the basin continues to the edge of the continental shelf.[11] The centre of the basin is located around 30 kilometres (19 mi) west of the Sydney central business district at Fairfield.[12][13]

The sand that was to become the sandstone of today was washed from Broken Hill and laid down about 200 million years ago. The ripple marks from the ancient river that brought the grains of sand are distinctive and easily seen, telling geologists that the sand comes from rocks formed between 500 and 700 million years ago far to the south. This means that the highest part of the visible lines almost always faces approximately south.[14] There are volcanic rocks from low hills in the shale landscapes. The Basin's sedimentary rocks have been subject to uplift with gentle folding and minor faulting during the formation of the Great Dividing Range.[15]

 Virtually all of Sydney's exposed rocks are sandstone (Narrabeen Group of sedimentary rocks at Narrabeen).
Virtually all of Sydney's exposed rocks are sandstone (Narrabeen Group of sedimentary rocks at Narrabeen).

At a time in the past, monocline formed to the west of Sydney. The monocline is a sloping bend that raises the sandstone well above where it is expected to be seen, and this is why the whole of the visible top of the Blue Mountains is made of sandstone. Sandstone slopes in the Sydney area are on three sides: to the west the Blue Mountains, and to the north and south, the Hornsby and Woronora plateaux'.[16][17][18]

Being very porous, the Sydney sandstone has shale lenses and fossil riverbeds dotted throughout and it is some 200 metres (656 feet) thick. The sandstone was probably deposited in a freshwater delta and is the caprock which controls the erosion and scarp retreat of the Illawarra escarpment.[19] Six kilometres of sandstone and shale lie under Sydney.[20] Bringelly Shale and Minchinbury Sandstone are often seen in the greater western parts of Sydney.[21][22] Ashfield Shale is observed in the inner western suburbs.[23] These components are part of the Wianamatta Shale group.[19] Mittagong Formation sighted in a few areas in northern Sydney.[24]

Prospect Hill in western Sydney is the largest assemblage of igneous rock in Sydney. The oval-shaped ridge was made many millions of years ago when volcanic material from the Earth's upper mantle moved upwards and then sideways.[25] Slow erosion of the overlying layers of sedimentary rock by the flow of rainwater have eventually laid bare the edges of the volcanic and metamorphic rocks of the intrusion.[26] The Gap, an ocean cliff on the South Head peninsula in Watsons Bay,[27] was laid as sediment more than 200 million years ago in the Triassic period. During the Jurassic era, a cataclysmic event resulted in an enormous crack forming within the strata. The Gap itself forms a sequence that continues offshore to the edge of the Sahul Shelf.[28]

Rivers

 View of Nepean River from just south of Penrith.
View of Nepean River from just south of Penrith.

The Nepean River rises to the south in the Woronora Plateau, and wraps around the western edge of the city. Swamps and lagoons are existent on the floodplain of the Nepean River, one being Bents Basin, which is also a recreational area. Where the Nepean turns east it becomes the Hawkesbury River, which winds through the Hornsby Plateau before emptying into Broken Bay. Broken Bay and the lower Hawkesbury form the commonly accepted boundary between Sydney and the Central Coast to the north. The remaining section of Warragamba River flows 3.5 kilometres (2.2 mi) north-east from the Warragamba Dam spillway to its confluence with the Nepean River.[29]

 View of Georges River as it passes through East Hills and Voyager Point.
View of Georges River as it passes through East Hills and Voyager Point.

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. The Hacking River is further south and runs through The Royal National Park into Port Hacking which forms the southern boundary of the Sutherland Shire.

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. At east Parramatta the river becomes a tidal estuary that flows into Port Jackson, commonly known as Sydney harbour. The reestablishment of foreshore mangroves has been a major focus of the ecological management of the Parramatta river and Sydney Harbour. Other major tributaries flow into Port Jackson from the North Shore and are the Lane Cove River and Middle Harbour Creek.

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. Cowan Creek and Berowra Creek run north from the Upper North Shore to the Hawkesbury river.[30] Sydney has a number of islands in its harbour and surrounding rivers. Such islands include, Shark Island, Cockatoo Island, Clark Island, Snapper Island, Spectacle Island and Goat Island in Port Jackson. Bare Island in Botany Bay. Lion Island, Long Island and Milson Island in Hawkesbury River. Scotland Island in the Northern Beaches. And Rodd Island in Parramatta River.[31]

Flora and fauna

Vegetation

Tree species
Scribbly gum, a small to medium sized tree named after the scribbles on its bark.
Turpentine tree, which can reach 60 metres (200 ft) in height.
Sydney red gum, a common woodland and forest tree of Eastern Australia.
Casuarina trees are the most widespread in Sydney after the eucalyptus.
Narrow-leaved bottlebrush is a shrub which has a rigid point, and red flower spikes in late spring or early summer.

The plant communities in the Sydney region are sclerophyll forests, which consist of wet and dry forests, thus making the city have two distinct biomes. Dry sclerophyll forests are the most predominant plants in the region, mainly occurring in the Cumberland Plain. They contain eucalyptus trees which are usually in open woodlands that have dry shrubs and sparse grass in the understory.[32] They have narrow, relatively tall, dense trees with a lush, moist understorey of fleecy shrubs and tree ferns. Plant species within the wet sclerophyll zone include blue gum, karrabina, peppermints and eucalyptus oreades. Wet sclerophyll forests are found in the cooler or wetter areas such as Northern Suburbs, Forest District, North Shore and in the Blue Mountains.[33]

Sclerophyll forests developed as a result of the extreme age of the continent combined with Aboriginal fire use. Deep weathering of the crust leached chemicals out of the rock, leaving Australian soils deficient in nutrients. The sandstone is the basis of the nutrient-poor soils found in Sydney that developed over millennia and 'came to nurture a brilliant and immensely diverse array of plants'. As plants cannot afford to lose leaves to herbivores when nutrients are scarce, they defend their foliage with toxins. In eucalypts, these toxins give the bush its distinctive smell.[34] The first European settlers saw Sydney's vegetation as "extremely barren, poor, hungry sand, thickly studded with rocks, growing nothing but a few miserable stunted gums and dwarf underwood". It has been calculated that around 98,000 hectares of native vegetation remains in the Sydney metropolitan area, about half of what is likely to have been existing at the time of European arrival.[35]

The Sydney Turpentine-Ironbark Forest, one of six main indigenous forest communities of Sydney, is an example of a dry sclerophyll forest, containing trees around 20–30 metres tall, with ground cover composed of flowering shrubs and native grasses.[36] The Blue Gum High Forest, strictly found in northern parts of Sydney, is a wet sclerophyll forest example, where the annual rainfall is over 1100 mm (43 in). It has trees between 20 and 40 metres tall.[37]

Species

The most widespread eucalyptus species in the Sydney region include:[38]

Non-eucalyptus tree species:

Common shrub species include, but are not limited to:

Biomes

Biomes
Grassy woodland in Smithfield, western Sydney.
Heathland on a road in Botany Bay National Park.
Blue Gum Walk, a wet sclerophyll forest in Berowra Valley National Park

Wildlife

Common native species
Commonly sighted in Sydney, Australian magpies are known for their distinctive, "gargling" calls.
Noisy miners are ubiquitous in urban, suburban and woodland areas.
Australian ravens are notable for their screechy, high pitched ah-ah-aaaah calls.
The pied currawong is a common bird in the plain and is usually seen in urban forests and backyards.
Grey-headed flying-foxes are found in suburban woods.
Blue-tongues are the predominant skink species in Sydney.
Redback spiders, which are venomous spiders, became widespread in the urban areas by the early 20th century.

The fauna of the Sydney area is diverse and its urban area is home to variety of bird and insect species, and also a few bat, arachnid and amphibian species. Introduced birds such as the house sparrow, common myna and feral pigeon are ubiquitous in the CBD areas of Sydney.[67][68] Moreover, possums, bandicoots, rabbits, feral cats, lizards, snakes and frogs may also be present in the urban environment, albeit seldom in city centers.[69]

About 40 species of reptiles are found in the Sydney region and 30 bird species exist in the urban areas.[70][71][72] Sydney's outer suburbs, namely those adjacent to large parks, have a great diversity of wildlife.[73] Since European settlement and the subsequent bushland clearing for the increasing population, 60% of the original mammals are now considered endangered or vulnerable, and many reptile species are experiencing population diminution and are becoming elusive.[74]

Tetrapods

This list includes bird species that are widespread in the Sydney metropolitan area:[75]

This list includes mammal, reptile and amphibian species that are spotted in the Sydney urban area:

Arthropods

This list includes insect, spider and centipede species that are commonly present in Sydney:

Topography

The oldest parts of the city are located in the flat areas south of the harbour; the North Shore was slower to develop because of its hilly topography, and was mostly a quiet backwater until the Sydney Harbour Bridge was opened in 1932, linking it to the rest of the city, with the suburbs surrounding the northern entrance to said bridge effectively developing North Sydney into a second central business district.[76]

The extensive area covered by urban Sydney is formally divided into more than 300 suburbs for addressing and postal purposes, and administered as 38 local government areas. The City of Sydney itself covers a fairly small area comprising the central business district and its neighbouring inner-city suburbs. Sydney's central business district (CBD) extends southwards for about 2 kilometres (1.25 mi) from Sydney Cove, the point of the first European settlement. The west side is bounded by Darling Harbour, a popular tourist and nightlife precinct while Central station marks the southern end of the CBD. George Street serves as the Sydney CBD's main north-south thoroughfare.[77]

 Parts of the North Shore and Northern Suburbs have lush, sclerophyll forest within residential areas, earning the region the nickname "The Leafy North Shore".
Parts of the North Shore and Northern Suburbs have lush, sclerophyll forest within residential areas, earning the region the nickname "The Leafy North Shore".

The Eastern Suburbs sit on the coast of Sydney. They contain iconic beaches such as Bondi Beach and Coogee beach, and feature prominent seaside cliffs. The suburbs of Maroubra, Coogee and Bondi Junction lie on steep slopes, and would have an elevation of 90 metres (295 feet) at the highest peaks. The Northern Suburbs of Sydney are characterised by pristine waterways with immense greenery and large plots of manicured land. Being around 80 to 180 metres (260 to 590 ft) above sea level, the region is very hilly and has a higher elevation than the rest of Sydney. Most of the North Shore suburbs are part of the Hawkesbury Plateau, a large sandstone plateau overlaid by a system of hilly ridges and gullies. Major waterways in the region include the Parramatta River, Lane Cove River and the many creek systems that branch out from these. The region is home to many parks and nature reserves — The Lane Cove National Park and the Garigal National Park include many areas of remnant bushland adjacent to the Lane Cove River and Middle Harbour.

The Hills District, situated halfway between the northern suburbs and greater western Sydney, is a region so named for its characteristically comparatively hilly topography, akin to the Northern Suburbs and North Shore. Several of its suburbs have the word 'Hills' in their names. As the name indicates, the Hills District, depending on the suburb, is around 80 to 180 metres (260 to 590 ft) above sea level. As such, its elevation creates orographic rainfall brought in by onshore winds from the Pacific Ocean.[78]

 Aerial view of Sydney's western suburbs surrounding Prospect reservoir (looking west of Cumberland Plain towards Blue Mountains).
Aerial view of Sydney's western suburbs surrounding Prospect reservoir (looking west of Cumberland Plain towards Blue Mountains).

The western suburbs predominantly lie on the Cumberland Plain and are relatively flat in contrast to the above regions.[79] They are situated on a rain shadow, thanks to the Hills District to the northeast. Thus, they tend to be drier than the coast and less lush than the hilly Northern Suburbs.[80] Despite being known as "flat", there are a number of ridgy areas on the plain — Western Sydney Parklands and Prospect Hill are between 130 to 140 metres (430 to 460 ft) high. Highly elevated suburbs, which typically range between 70 to 100 metres (230 to 330 ft) in height, include Leppington and Oran Park to the southwest, Pemulwuy, Cecil Hills and Horsley Park to the greater west, and Greystanes, Seven Hills and Mount Druitt to the northwest.[81] Agriculture is mainly concentrated in the outskirts of the Greater Western Sydney area, such as in suburbs of Kemps Creek, Orchard Hills, Luddenham and Horsley Park, among others, which lie in a countryside.[82]

Recreational areas

 Mrs Macquarie's Point, in The Domain, shapes the northeastern tip of Farm Cove and provides panoramic views over the bay to the Opera House and the city skyline.
Mrs Macquarie's Point, in The Domain, shapes the northeastern tip of Farm Cove and provides panoramic views over the bay to the Opera House and the city skyline.

The Sydney CBD contains prominent parks such as, Hyde Park, The Domain and Royal Botanic Gardens and Farm Cove on the harbour. Other parks in that vicinity include Wynyard and Hyde Park. The Royal Botanic Gardens is the most important green space in the Sydney region, hosting both scientific and leisure activities.[83] There are 15 separate parks under the administration of the City of Sydney.[84] The Royal National Park was proclaimed on 26 April 1879 and with 13,200 hectares (51 square miles) is the second oldest national park in the world.[85]

The largest park in the Sydney metropolitan region is Ku-ring-gai Chase National Park, established in 1894 with an area of 15,400 hectares (59 square miles).[86] It is regarded for its well-preserved records of indigenous habitation and more than 800 rock engravings, cave drawings, and middens have been located in the park.[87] The Domain is the oldest public parkland in Australia and measures 16.2 hectares (0.1 square miles) in area.[88] Its location was used for both relaxation and the grazing of animals from the earliest days of the colony.[89]

 Bondi Beach is one of the most visited tourist sites in Australia.
Bondi Beach is one of the most visited tourist sites in Australia.

The inner west suburbs include Centennial Park and Moore Park in the east, Sydney Park and Royal National Park in the south, Ku-ring-gai Chase National Park in the north, and Western Sydney Parklands in the west. Other major parks in the Sydney metropolitan area include Auburn Botanical Gardens, Central Gardens Nature Reserve, Heathcote National Park, Georges River National Park, Lane Cove National Park and Blue Mountains National Park. There are large parks and reserves surrounding prominent bodies of water, such as those around Prospect Reservoir, Chipping Norton Lake, Lake Parramatta and Nepean River (Bents Basin).[90]

Sydney has some of the finest and most famous beaches in the world. There are well over 100 beaches in the city, ranging in size from a few feet to several kilometres, located along the city's Pacific Ocean coastline and its harbours, bays and rivers. With around 70 surf beaches and dozens of harbour coves, Sydney is almost unrivalled in the world for the number and quality of beaches available.[91] The water and sand among the city beaches, despite their popularity, are remarkably clean.[92] The beach watch program was established in 1989 in response to community concern about the impact of sewage pollution on human health and the environment at Sydney's ocean beaches.[93]

Regions

There are a number of informal regional names describing large sections of the urban area. Not all suburbs are necessarily covered by any of the following informal regional categories.[94]

The regions are Canterbury-Bankstown, the Eastern Suburbs, the Forest District, Greater Western Sydney, the Hills District, the Inner West, the Macarthur region, the Northern Beaches, the Northern Suburbs, the North Shore, Southern Sydney, South-western Sydney, the St George district, the Sutherland Shire and Western Sydney. The Blue Mountains are at times considered to be part of Sydney's metropolitan area.

The largest commercial centres outside of the CBD are North Sydney and Chatswood in the north, Parramatta to the west, Liverpool in the south-west, Hurstville in the south, and Bondi Junction to the east. There has been accelerating commercial development in Parramatta since the 1950s as firms serving Western Sydney have set up regional offices and recognised the region's significant residential population mass and cheaper rents.[95]

Climate

 Thunderstorms and lightnings occasionally occur in the warm months.
Thunderstorms and lightnings occasionally occur in the warm months.

Sydney has a humid subtropical climate (Cfa) with warm, sometimes hot summers, and winters shifting from mild to cool. Although Sydney is predominantly humid subtropical, the hilly wet areas in the North Shore, Northern Suburbs, Forest District and Hills District have an oceanic climate (Cfb).[96] The weather is moderated by proximity to the ocean, and more extreme temperatures are recorded in the inland western suburbs.[97]

The warmest month in the CBD is January, with an average air temperature range at Observatory Hill of 19.6–26.5 °C (67.3–79.7 °F). The coldest month is July, with an average range of 8.7–17.4 °C (47.7–63.3 °F). In the west, the temperatures average between 17.5–28.4 °C (63.5–83.1 °F) in summer. In winter, they're normally between 6.2–17.4 °C (43.2–63.3 °F). In late spring and summer, Sydney can sometimes get northwesterly winds from the Outback, which are dry and hot, making the temperatures reach above 40 °C (104.0 °F). Frost is oftentimes observed in the outer suburbs.[98]

Rainfall is spread throughout the year, but is slightly higher during the first half of the year when easterly winds dominate.[99] Sydney's coast generally receives around 1,000 mm (39.37 in) to 1,200 mm (47.24 in) of rain annually. The western suburbs receive around 800 mm (31.50 in) to 900 mm (35.43 in) of precipitation, since moist onshore winds don't penetrate inland. Australian east coast low brings large amounts of rain in late autumn and winter.[100]

See also

References

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Sources

External links

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