England, Wales and Scotland are the three countries which form Great Britain, 229,850 km2 (88,745 sq miles), which is the largest island in the archipelago off the west coast of Europe that also includes Ireland, the Faroes, the Orkney Islands, and the Isle of Man.
People often wonder why the island is called Great Britain rather than just Britain. The reason for this is that there are two Britains: the island of Britain in the British Isles; and the land of Britain in France. In French these are known as Grande Bretagne and Bretagne; in English, Great Britain and Brittany.
The word Great in this context has its old meaning of big as in she was great with child or Greater London. Likewise, the ending -y on the end of Brittany has the meaning Little as in doggy meaning small dog or Jimmy meaning little Jim.