Countries
United Kingdom
Also Known As United Kingdom of Great Britain and Northern Ireland
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The United Kingdom occupies most of the British Isles off the northwest coast of continental Europe, comprising Great Britain, England, Scotland and Wales, together with Northern Ireland on the island of Ireland. The 1707 Acts of Union joined the Kingdoms of England and Scotland into the Kingdom of Great Britain; a further Act of Union in 1801 joined Great Britain with the Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland. Most of Ireland left the union after the Irish War of Independence, and the 1922 settlement fixed the present territorial form, the United Kingdom of Great Britain and Northern Ireland. Its capital, London, sits on the River Thames in southeastern England.
Facts
PopulationBritannica 2025 estimate. Population Estimate Year Area (sq km) Independence or Founding Year1801 legislation joined Great Britain (itself formed by the 1707 union of England and Scotland) with Ireland to create the United Kingdom of Great Britain and Ireland. The present territorial form, the United Kingdom of Great Britain and Northern Ireland, dates from 1922, after most of Ireland left the union; 1801 is recorded here as the founding of the United Kingdom as a state, with the 1707 and 1922 milestones kept in this note. Learn More
Three Unions
This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
The United Kingdom this atlas records today is the product of three separate acts of union, each changing what the word Britain actually meant. The first, in 1707, joined the once-independent Kingdoms of England and Scotland, which had shared a monarch since 1603 but kept separate parliaments until the Acts of Union dissolved both and created a single Parliament of Great Britain at Westminster. The second, in 1801, joined that Kingdom of Great Britain with the Kingdom of Ireland, forming the United Kingdom of Great Britain and Ireland, a state that governed the whole of the British Isles as a single political unit for over a century. The third came in 1922, not an addition but a subtraction: after the Irish War of Independence, the Anglo-Irish Treaty let the southern twenty-six counties leave as the Irish Free State, while six northern counties remained inside the union as Northern Ireland, fixing the territory in its present form. The state kept the name United Kingdom of Great Britain and Ireland for five more years afterward; only the Royal and Parliamentary Titles Act, receiving royal assent on 12 April 1927, renamed it the United Kingdom of Great Britain and Northern Ireland. This atlas dates the United Kingdom's own founding to 1801, the year the name itself was first used for a single state, while carrying the 1707 union, the 1922 partition and the 1927 renaming in the same fact rather than picking one to represent all three.
Four Nations, One State
This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
England, Scotland, Wales and Northern Ireland are each, in ordinary usage, called a country, and the United Kingdom is the single sovereign state that contains all four of them at once, a structure that confuses almost everyone who did not grow up inside it. England has no devolved parliament of its own, governed directly from Westminster; Scotland, Wales and Northern Ireland each have their own devolved legislature, with varying powers over health, education and other domestic policy, won gradually since the late 1990s rather than granted at the country's 1801 or 1922 founding. A resident of Cardiff or Edinburgh genuinely has two governments, a devolved one and the UK one in London, answerable for different things, which is part of why questions of independence, Scottish most prominently, keep recurring inside a union old enough that most of its citizens have never known anything else. London sits at the center of all of it: the seat of the UK Parliament and the Crown, but not, formally, the seat of an English parliament that does not exist.
Cross-Tradition Connections
Associated With
London, Cities London is the capital and largest city of the United Kingdom.
The United Kingdom is one of the states bordering the North Sea.
The River Thames runs entirely in England, reaching London before emptying into the North Sea.
Bordered By Water
Has Capital
London, Cities London is the capital of the United Kingdom.
On Continent
Rivers Through Territory
Sources
1. Encyclopaedia Britannica
Encyclopaedia Britannica, Inc.United Kingdom: History, Population, Map, Flag, Capital, and FactsView the Source 1. Encyclopaedia Britannica
1. Encyclopaedia Britannica
1. Encyclopaedia Britannica
1. Encyclopaedia Britannica
London (Wikipedia)
Wikimedia FoundationAssociated With: London, InfoboxQuote, Associated With: London, Infobox
Sovereign state: United Kingdom
View the Source London (Wikipedia)
Wikimedia FoundationHas Capital: London, Lead section, capital factQuote, Has Capital: London, Lead section, capital fact
London is the capital and largest city of England and the United Kingdom, with a population of 9.14 million people in 2025.
View the Source River Thames (Wikipedia)
Wikimedia FoundationRivers Through Territory: River Thames, Infobox, Location fieldQuote, Rivers Through Territory: River Thames, Infobox, Location field
England
View the Source North Sea (Wikipedia)
Wikimedia FoundationBordered By Water: North Sea, Infobox/lead, bordering countriesQuote, Bordered By Water: North Sea, Infobox/lead, bordering countries
the United Kingdom, Norway, Denmark, Germany, the Netherlands, Belgium, and France
View the Source Manchester (Wikipedia)
Wikimedia FoundationAssociated With: Manchester, Infobox, CountryQuote, Associated With: Manchester, Infobox, Country
United Kingdom
View the Source Birmingham (Wikipedia)
Wikimedia FoundationAssociated With: Birmingham, Infobox, CountryQuote, Associated With: Birmingham, Infobox, Country
United Kingdom
View the Source Glasgow (Wikipedia)
Wikimedia FoundationAssociated With: Glasgow, Infobox, CountryQuote, Associated With: Glasgow, Infobox, Country
United Kingdom
View the Source Cambridge (Wikipedia)
Wikimedia FoundationAssociated With: Cambridge, Infobox, Sovereign stateQuote, Associated With: Cambridge, Infobox, Sovereign state
United Kingdom
View the Source Edinburgh (Wikipedia)
Wikimedia FoundationAssociated With: Edinburgh, Infobox, Sovereign stateQuote, Associated With: Edinburgh, Infobox, Sovereign state
United Kingdom
View the Source Oxford (Wikipedia)
Wikimedia FoundationAssociated With: Oxford, Infobox, Sovereign stateQuote, Associated With: Oxford, Infobox, Sovereign state
United Kingdom
View the Source Leeds (Wikipedia)
Wikimedia FoundationAssociated With: Leeds, Infobox, CountryQuote, Associated With: Leeds, Infobox, Country
United Kingdom
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