Wollongong - Geography

Geography

The city of Wollongong has a distinct geography. It lies on a narrow coastal plain flanked by the Tasman Sea to the east and a steep sandstone precipice known as the Illawarra Escarpment to the west. The coastal plain is widest in the south and narrowest in the north, with the city centre located about midway. South of the city centre but within the urban area is Lake Illawarra, a large lagoon.

The escarpment ranges between 150 and 750 metres (490–2,460 ft) above sea level, with locally famous mountains such as Mount Keira (464m), Mount Kembla (534m), Broker's Nose (440m) and Mount Murray (768m) to the south. It contains strata of coal measures, and the adit entrances to many coal mines have been established along the slopes of the escarpment throughout Wollongong. Suburbia encroaches on the escarpment’s lower slopes in some areas, but the majority remains in a relatively natural state forested with dry sclerophyll and pockets of temperate rainforest. The escarpment is largely protected by a State Conservation Area and local scenic protection zoning, and provides the visual backdrop to the city.

In the north the escarpment meets the coatline, and north of this the coastal road Lawrence Hargrave Drive hugs the cliffline. The unstable geology of the escarpment resulted in rockfalls, forcing the closure of the road. Subsequently part of Lawrence Hargrave Drive was replaced in 2005 by the Sea Cliff Bridge just off the coast, crossing the submerged rock shelf. The bridge carries both vehicular and pedestrian traffic. The South Coast railway line must go through several tunnels to reach the Sydney metropolitan area. The Southern Freeway and Princes Highway, Australia provide alternative inland routes, descending the escarpment further south at Bulli Pass or at Mount Ousley, entering just north of Wollongong's city centre.

To the south the plain reaches its maximum extent around Albion Park where it incorporates a large coastal saltwater lagoon called Lake Illawarra, separated from the Pacific Ocean by a long sandy spit.

The coastal strip consists of highly fertile alluvium, which made Wollongong so attractive to agriculturists in the nineteenth century. It contains many hills including the foothills of the escarpment’s lower slopes, and while these generally do not exceed one hundred metres in height they give much of the city an undulating character. The coastal strip is traversed by several short but flood-prone and fast-flowing streams and creeks such as Para Creek, Allans Creek, Nostaw Ravine, Jimbob Creek, Mullet Creek and Macquarie Rivulet.

The coastline consists of many beaches characterised by fine pale gold-coloured sands; however, these beaches are sometimes interrupted by prominent and rocky headlands, such as Tego Rock, jutting into the sea. In places these headlands have been excavated or extended to create artificial harbours at Wollongong, Port Kembla, Shellharbour and Kiama. Just off the coast south of Wollongong centre, near Port Kembla, lies a group of five islands known collectively as The Five Islands. The islands are a wildlife refuge.