There are over a 1000 islands included in the British Isles. The most northerly inhabited island is called Unst.
But the most northly Island is called Out Stack
see the related link below for further details.
There are two points that can be mentioned the southernmost point and the southernmost settlement. The point is Les Minquiers Reef, Jersey, Channel Islands and the city on the island is Saint Clement.
The most northerly point of the mainland of England is Marshall Meadows Bay, Northumberland.
Unst, in Shetland
The northernmost point on Canada's mainland is Murchison Promontory on Boothia Peninsula, in the Nunavut territory. It is located at 71°58'N.
The geographic importance of Cape York is that it is mainland Australia's northernmost point.
The northernmost tip of mainland Australia is Cape York. It is located on Cape York Peninsula, in Queensland.
There are very very very many. Maybe you think of Nordkapp, the northernmost point in mainland Europe.
Helsinki
Australia's northernmost point is Cape York, which is the far north tip of Queensland.
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.)
Different possibilities. Cape Reinga is commonly referred to as the northernmost point on the mainland but Surville Cliffs is more accurate, though there is no settlement there. The northernmost island territory is Nugent Island.
The distance between the Northernmost point in the United Kingdom to the Southernmost point in the United Kingdom is 650 miles or 965 kilometers. The United Kingdom's British Isles are about the size of the state of Oregon.
Alaska
Nordkapp is the northernmost point in Norway.
A cape of northern Greenland on the Arctic Ocean. It is the northernmost point of land in the world.