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What Is The Other Major Island In The UK?

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Last updated on 6 min read

The other major island in the UK is Ireland, which is partially occupied by Northern Ireland (part of the UK) and the Republic of Ireland.

How many islands are in the UK?

There are approximately 6,000 islands in the UK, according to the Ordnance Survey and other geographic surveys as of 2026.

Most of these islands are tiny and empty. Great Britain is the biggest and most famous. The count includes the Isle of Man and the Channel Islands, though neither is technically part of the UK—they’re Crown Dependencies. Then you’ve got the Hebrides, Orkney, and Shetland archipelagos adding thousands more to the total. Ordnance Survey keeps the detailed maps that confirm this number.

What is the main island of the UK called?

The main island of the UK is called Great Britain, which comprises England, Wales, and Scotland.

Great Britain is the largest island in the British Isles and acts as the geographical heart of the United Kingdom. It’s separated from Ireland by the Irish Sea and from Europe by the English Channel. The name comes from the Roman "Britannia Major," which set it apart from "Britannia Minor" (modern-day Brittany in France). Encyclopaedia Britannica has the historical and geographical breakdown if you want more detail.

What are the two large islands of the UK?

The two large islands of the UK are Great Britain and the island of Ireland—though only part of Ireland is part of the UK.

Great Britain sits entirely within the UK. The island of Ireland is split between the UK (Northern Ireland) and the Republic of Ireland. The Isle of Man and the Channel Islands matter too, but they’re Crown Dependencies, not part of the UK. These technicalities matter for legal and political reasons. The UK Government spells out these classifications in official documents.

What are the largest islands of the UK?

The largest islands of the UK by area are Great Britain, Ireland, Lewis and Harris, and the Isle of Skye.

Great Britain towers over the rest. Ireland comes next, though only Northern Ireland belongs to the UK. Lewis and Harris, in the Outer Hebrides, is Scotland’s largest island by area. The Isle of Skye is the most populated. The Isle of Wight? Often mentioned, but much smaller. Data from Natural Resources Wales and the Scottish Government backs up these rankings as of 2026.

RankIslandArea (km²)
1Great Britain209,331
2Ireland84,421
3Lewis and Harris2,178
4Isle of Skye1,656
5Isle of Wight384

Is Britain and England same?

No, Britain and England are not the same—England is one of the four countries that make up Great Britain and the UK.

Great Britain is the island that holds England, Wales, and Scotland. The UK is the political union of four countries: England, Wales, Scotland, and Northern Ireland. People often mix up "Britain" with the UK, but technically it only refers to Great Britain. The UK Parliament spells this out in official terms.

Which country is in the United Kingdom but not in Great Britain?

Northern Ireland is the country in the United Kingdom that is not in Great Britain.

Northern Ireland sits on the island of Ireland, separate from Great Britain. The rest of the UK—England, Wales, and Scotland—all call Great Britain home. This split is both geographic and political, laid out in the UK’s constitutional setup. The Northern Ireland Executive details its status within the UK.

What is the smallest island in the UK?

The smallest inhabited island in the UK is Bishop’s Rock, part of the Isles of Scilly, with an area of just 46 square meters.

Uninhabited islands like the foundation of Bishop Rock Lighthouse are smaller, but Bishop’s Rock holds the title for inhabited ones. The Isles of Scilly, where it sits, include five inhabited islands and plenty of smaller islets. The Council of the Isles of Scilly confirms this as of 2026. Sark, often tossed around in these discussions, is way bigger with around 600 residents.

Which country has the most islands in the world?

Sweden has the most islands in the world, with approximately 221,800 islands, according to the World Atlas and Swedish authorities as of 2026.

Sweden’s archipelago stretches along its coastline, especially around Stockholm, which is built across 14 islands. Most of these islands are empty, but they shape the country’s geography and tourism. The Swedish Institute and Statistics Sweden track these numbers.

Is the UK classed as an island?

The UK is classified as an island country, consisting of the island of Great Britain, the northeastern part of the island of Ireland, and over 6,000 smaller islands.

An island country is a sovereign state made up entirely of one or more islands or parts of islands. The UK fits this, even though it’s connected to Europe via the Channel Tunnel. The CIA World Factbook lists the UK as an island nation based on its geography.

Is Isle of Man bigger than Isle of Wight?

No, the Isle of Man is not bigger than the Isle of Wight—the Isle of Wight is larger in area.

The Isle of Wight covers about 384 km², while the Isle of Man stretches to roughly 572 km². But the Isle of Man has fewer people—around 85,000 compared to the Isle of Wight’s 140,000. The Isle of Man is a Crown Dependency, meaning it governs itself but isn’t part of the UK. The Isle of Man Government and UK Government have the numbers.

Is Ireland bigger than England?

Yes, the island of Ireland is larger than England in total area.

The island of Ireland covers about 84,421 km², while England alone is roughly 130,279 km². If you compare just the Republic of Ireland (70,273 km²) to England, Ireland is smaller. The difference depends on whether you include Northern Ireland. The UK Office for National Statistics and Central Statistics Office Ireland keep these measurements current.

Is Scotland bigger than Ireland?

No, Ireland (including Northern Ireland) is larger than Scotland.

Scotland covers about 77,933 km², while the whole island of Ireland spans 84,421 km². Scotland has around 5.5 million people, while Ireland has about 7 million. The Republic of Ireland alone is slightly smaller than Scotland at 70,273 km². These figures come from the Scottish Government and CSO Ireland as of 2026.

Is mull bigger than Arran?

Yes, the Isle of Mull is larger than the Isle of Arran in both area and population.

The Isle of Mull covers roughly 875 km² and has about 2,800 residents. The Isle of Arran spans around 432 km² with about 4,600 people. Mull is famous for its wild landscapes and wildlife, while Arran is nicknamed "Scotland in Miniature" for its varied terrain. VisitScotland and Argyll and Bute Council have the tourism and geographic data to back this up.

Is Isle of Man part of UK?

No, the Isle of Man is not part of the UK—it is a self-governing Crown Dependency.

The Isle of Man is under the British Crown’s sovereignty but isn’t part of the United Kingdom or the European Union. It runs its own government, parliament (Tynwald), and legal system. The UK Government’s official guidance spells out its status as of 2026.

Edited and fact-checked by the MeridianFacts editorial team.
Elena Rodriguez
Written by

Elena Rodriguez is a cultural geography writer and travel journalist who has visited over 40 countries across the Americas and Europe. She specializes in the intersection of place, history, and culture, and believes every map tells a human story.

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