The northernmost tip of mainland Australia is Cape York. It is located on Cape York Peninsula, in Queensland.
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".
The southern tip of Africa is closer to the South Pole than the southernmost edge of mainland Australia. The southern tip of Africa reaches down to about 34 degrees south latitude, while the southernmost edge of mainland Australia is around 39 degrees south latitude.
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.)
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.
Point Barrow.
Northernmost tip of the island of Newfoundland.