Australia's northernmost point is Cape York, which is the far north tip of Queensland.
On the mainland it would be Seisia just north of Bamaga on Cape York Peninsula. Alternatively, it would be Thursday Island, a small island community just off the tip of Cape York.
Boigu Island is the most northerly inhabited island in Australian territory. It is part of the top-western group of the Torres Strait Islands. Cape York, on Cape York Peninsula, Queensland, is the northernmost tip of the Australian mainland.
The geographic importance of Cape York is that it is mainland Australia's northernmost point.
It depends on which "top" is meant. Australia's northernmost tip is called Cape York. It is the tip of the peninsula which defines the northern boundary of Queensland. The northern half of the Northern Territory is colloquially known as the "Top End".
Helsinki
The northernmost city on Canada's mainland is Yellowknife, capital of Northwest Territories. (Dawson City, Yukon, which is further north than Yellowknife, is a town and not a city. Iqaluit, capital of Nunavut, is Canada's northernmost city, but is located on Baffin Island and not on the mainland.)
The southern tip of Africa, Cape Agulhas, is closer to the South Pole than the southernmost edge of mainland Australia, South Point in Wilsons Promontory National Park. Cape Agulhas is located at approximately 34.8 degrees south latitude, while South Point is situated at around 39.1 degrees south latitude. This means that Cape Agulhas is closer to the South Pole by about 4.3 degrees of latitude.
Southern edge Australia
Northwest Angle, Minnesota (49°23' 4.1"N) is the northernmost point in the 48 contiguous states.It is a misconception that Maine has the most northernmost point in the Lower 48. However, this is due to the type of map it is. A Lambert Equal-area conic projection, for example, appears to say that the western tip of Washington state is aligned with the northernmost tip of Maine. If you look at a cylindrical projection, you will see that the states bordering Canada west of the Great Lakes are well above the latitude that Maine sits on, and Minnesota has a small triangular tip at the border of Manitoba.
The most southern edge of mainland Australia is closer to the south pole than the most southern tip of Africa.Additionally, the southern most tip of New Zealand is a bit closer than that and the tip of South America is the closest. See the link below.
Point Barrow.