5-463: Cape Northumberland is a headland in the southeast of the Australian state of South Australia . It is the southernmost point of South Australia. It is located about 3 kilometres (1.9 mi) from the town of Port MacDonnell , 28 kilometres south southwest from the municipal seat of Mount Gambier and about 393 kilometres (244 mi) southeast of the state's capital Adelaide . Cape Northumberland
10-401: A head , is a coastal landform , a point of land usually high and often with a sheer drop, that extends into a body of water . It is a type of promontory . A headland of considerable size often is called a cape . Headlands are characterised by high, breaking waves , rocky shores , intense erosion , and steep sea cliff . Headlands and bays are often found on the same coastline. A bay
15-405: Is flanked by land on three sides, whereas a headland is flanked by water on three sides. Headlands and bays form on discordant coastlines, where bands of rock of alternating resistance run perpendicular to the coast. Bays form when weak (less resistant) rocks (such as sands and clays ) are eroded, leaving bands of stronger (more resistant) rocks (such as chalk , limestone , and granite ) forming
20-548: Is marked by a monument. The cape is located on the southeast coast of South Australia. It is the western end of Discovery Bay and its subsidiary, MacDonnell Bay . The cape was described in 2017 in an American source as being "about 30 metres (98 ft) high, is rugged and cliffy, with a hill rising to an elevation of 41 metres (135 ft) behind it. It is the southernmost point on the South Australian coastline. Climate Headland A headland , also known as
25-506: Was named after Hugh Percy, Duke of Northumberland , by the Royal Navy officer, James Grant , on 3 December 1800, when he was mapping the southern coast of Australia aboard HMS Lady Nelson . The cape is the site of the historic Cape Northumberland Lighthouse , built in 1858. Because it was being undermined by the sea, a new lighthouse was constructed in 1882, about 700 metres (2,300 ft) further inland. The position of original lighthouse
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