Part of Great Britain is a term used to refer to the constituent countries of the United Kingdom. These countries include ENGLAND, WALES, Scotland, and Northern Ireland. ENGLAND is the largest and most populous country in the UK, with a population of over 55 million people. WALES is the second-largest country in the UK, with a population of around 3 million people. Both ENGLAND and WALES are part of the island of Great Britain, which is located off the northwest coast of continental Europe.