Cape Leeuwin /ˈluːwɪn/ is the most south-westerly mainland point of the Australian Continent, in the state of Western Australia.
A few small islands and rocks, the St Alouarn Islands, extend further to the south. The nearest settlement, north of the cape, is Augusta. South-east of Cape Leeuwin, the coast of Western Australia goes much further south. Located on headland of the cape is the Cape Leeuwin Lighthouse and the buildings that were used by the lighthouse keepers.
In Australia, the Cape is considered the point where the Indian Ocean meets the Southern Ocean; however most other nations and bodies consider the Southern Ocean to only exist south of 60°S.
Cape Leeuwin is often grouped with the next headland north, Cape Naturaliste, to identify the geography and ecology of the region. One example is in the name Leeuwin-Naturaliste National Park. Another is in the use of the phrases Cape to Cape or the Capes in tourist promotional materials. A shore base and a ship of the Royal Australian Navy have been named HMAS Leeuwin after the cape.
Matthew Flinders named Cape Leeuwin after the first known ship to have visited the area is the Leeuwin ("Lioness"), a Dutch vessel that charted some of the nearby coastline in 1622. The log of the Leeuwin has been lost, so very little is known of the voyage. However, the land discovered by the Leeuwin was recorded on a 1627 map by Hessel Gerritsz: Caert van't Landt van d'Eendracht ("Chart of the Land of Eendracht"), which appears to show the coast between present-day Hamelin Bay and Point D’Entrecasteaux. Cape Leeuwin itself cannot be recognised.
Other European vessels passed by for the next two centuries, including the Dutch 't Gulden Zeepaert, commanded by François Thijssen, in 1627 and the French Gros Venture, under Louis Aleno de St Aloüarn, in 1772.
The first known sighting of the cape was by Bruni d'Entrecasteaux in 1791. d'Entrecasteaux thought the cape was an island, and named it "Isle St Allouarn" ("St Allouarn Island"), in honour of Captain de St Aloüarn. Ten years later, Matthew Flinders began his survey of the South coast of New Holland from Cape Leeuwin in 1801 when he named it. Flinders landed in the bay to the east of Cape Leeuwin, today’s Flinders Bay. Flinders was aware that the area had been known to the Dutch as "Leeuwin's Land".
At two in the morning we had 80 fathoms, and veered towards the land. It was seen from the masthead at five; and the highest part, the same which had been set in the evening, bore N. 12° W. This is the largest of the before-mentioned Isles of St Alouarn; but at half past seven we saw hills extending from behind, and, to all appearance, joining it to the mainland. This supposed isle is, therefore, what I denominate "Cape Leeuwin", as being the south-western and most projecting part of Leeuwin's Land.
The St Alouarn Islands is a group of islands off the tip of Cape Leeuwin.
The hillside to the west of the lighthouse, and the land nearby is now part of Leeuwin-Naturaliste National Park. It has extensive heath vegetation and thick scrub which supports a very high number of plant species and also bird species that utilise this habitat. The bay just east of Cape Leeuwin is Flinders Bay, named after Matthew Flinders, the circumnavigating explorer of the early 19th century.
Shipwrecks within sight of this location include SS Pericles, an iron-screw steamer built in Belfast in Northern Ireland, which sank after hitting an uncharted rock on a clear calm day in 1910. The wreck was found by Tom Snider in 1957 at 34°25.33′S 115°08.24′E. He dived on the wreck to recover the lead that was being carried by the ship.
Some shipwrecks are identified as being within the vicinity of Augusta, Cape Leeuwin or Hamelin Bay that might not be within visual distance of the lighthouse.