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The United Kingdom is made up of four nations: England, Scotland, Wales, and Northern Ireland. Each has its own identity, culture, and history, but all are united under a single government in London.

England is the largest nation in area and population, occupying the southern and central part of Great Britain. Scotland lies to the north. Wales is to the west and has its own language, Welsh (Cymraeg), spoken alongside English. Northern Ireland is on the island of Ireland, sharing a border with the Republic of Ireland, which is a separate, independent country — not part of the UK.

The full official name is the United Kingdom of Great Britain and Northern Ireland. People from the UK are called British, though many also identify as English, Scottish, Welsh, or Northern Irish.

The four nations were united over centuries through conquest, treaties, and Acts of Union. Today, Scotland, Wales, and Northern Ireland each have devolved governments handling local matters like education and health, while the UK Parliament at Westminster retains authority over defence, foreign policy, and taxation.

Great Britain refers to the island containing three nations: England, Scotland, and Wales. It does not include Northern Ireland. The United Kingdom includes all four nations — England, Scotland, Wales, and Northern Ireland.

The British Isles is a geographical term for the group of islands including Great Britain, Ireland, and smaller islands such as the Isle of Wight, the Hebrides, and the Orkney and Shetland Islands.

Britain is often used informally to mean the UK, though strictly it refers only to Great Britain. For the Life in the UK test, know the precise differences.

The Union Flag (often called the Union Jack) is the national flag of the United Kingdom. It combines the crosses of the patron saints of England, Scotland, and Ireland. Wales is not represented on the Union Flag because Wales had already been united with England before the first Union Flag was created in 1606.

Each UK nation has its own capital city. London is the capital of England and the entire United Kingdom — seat of the UK Parliament and home of the monarch. Edinburgh is the capital of Scotland, Cardiff is the capital of Wales, and Belfast is the capital of Northern Ireland.

Each nation has a patron saint and saint's day: St George (England, 23 April), St Andrew (Scotland, 30 November), St David (Wales, 1 March), and St Patrick (Northern Ireland, 17 March).

The nations have distinctive national flowers: the rose (England), the thistle (Scotland), the daffodil and leek (Wales), and the shamrock (Northern Ireland).

These symbols appear on coins, stamps, and official emblems. The patron saints' days are not public holidays in most of the UK but are celebrated with cultural events.