Introduction
Islands range from tiny coral atolls to landmasses larger than most countries. The distinction between an island and a continent is somewhat arbitrary - Australia is a continent, but Greenland is an island.
The world's largest islands are found in the Arctic, Southeast Asia, and the tropics. Each has unique ecosystems shaped by their isolation.
1. Greenland
- Area: 2,166,086 km²
- Population: ~56,000
- Country: Denmark (autonomous)
- Ice Coverage: 80%
Greenland is by far the world's largest island. Despite its enormous size, it has a tiny population because 80% of the land is covered by a massive ice sheet up to 3 km thick.
If Greenland's ice sheet melted completely, global sea levels would rise by about 7 meters.
2. New Guinea
- Area: 786,380 km²
- Population: ~12 million
- Countries: Indonesia, Papua New Guinea
New Guinea is the second largest island and the most linguistically diverse place on Earth, with over 1,000 languages spoken. The island is divided between Indonesia and Papua New Guinea.
Its central highlands were unknown to the outside world until the 1930s, when explorers found a million people living in fertile valleys.
3. Borneo
- Area: 748,168 km²
- Population: ~22 million
- Countries: Malaysia, Indonesia, Brunei
Borneo is shared by three countries and is home to some of the oldest rainforests on Earth, estimated at 140 million years old. The island is a biodiversity hotspot.
Borneo's orangutans, pygmy elephants, and proboscis monkeys are found nowhere else in the wild.
4. Madagascar
- Area: 587,041 km²
- Population: ~29 million
- Country: Madagascar
Madagascar split from mainland Africa about 88 million years ago, and its long isolation created extraordinary biodiversity. About 90% of its wildlife is found nowhere else.
Lemurs, baobab trees, and chameleons are among the island's most iconic species.
5. Baffin Island
- Area: 507,451 km²
- Population: ~13,000
- Country: Canada (Nunavut)
Baffin Island is the largest island in Canada and the fifth largest in the world. It is sparsely populated, with most residents being Inuit.
The island has dramatic fjords, glaciers, and some of the oldest rocks on Earth, dating back 2.5 billion years.
6. Sumatra
- Area: 473,481 km²
- Population: ~59 million
- Country: Indonesia
Sumatra is one of the most geologically active islands on Earth, sitting on the Ring of Fire. The 2004 Indian Ocean tsunami originated off its coast.
The island is home to critically endangered Sumatran tigers, rhinos, and orangutans.
7. Honshu
- Area: 227,960 km²
- Population: ~104 million
- Country: Japan
Honshu is the most populous island in the world, home to Tokyo, Osaka, and most of Japan's major cities. It is the seventh largest island globally.
Mount Fuji, Japan's iconic peak, rises from the center of Honshu.
8. Great Britain
- Area: 209,331 km²
- Population: ~65 million
- Countries: England, Scotland, Wales
Great Britain is the largest island in Europe. It was connected to mainland Europe by a land bridge until about 8,000 years ago.
The island has had an outsized influence on world history, language, and culture.
9. Ellesmere Island
- Area: 196,235 km²
- Population: ~140
- Country: Canada (Nunavut)
Ellesmere Island is the most northerly major island in the world, reaching within 800 km of the North Pole. It has ice shelves, glaciers, and 24-hour darkness in winter.
Despite its extreme remoteness, archaeological evidence shows human habitation dating back 4,000 years.
10. Sulawesi (Celebes)
- Area: 180,681 km²
- Population: ~20 million
- Country: Indonesia
Sulawesi has one of the most unusual shapes of any island, with four long peninsulas. Its unique biogeography places it between Asian and Australian fauna.
The island contains the world's oldest known cave art, dating back at least 45,500 years.
Key Facts
- If Australia were classified as an island, it would be 3.5x larger than Greenland.
- Six of the ten largest islands are in the Asia-Pacific region.
- Greenland's ice sheet contains enough water to raise global sea levels by 7 meters.
- New Guinea has more languages than any other island (over 1,000).
- The combined population of the world's 10 largest islands exceeds 300 million people.
Fun Facts
- Greenland's population density is 0.03 people per km², making it the least densely populated territory on Earth.
- Madagascar has been called the "eighth continent" due to its unique biodiversity.
- Honshu is more populous than most countries in the world.
- Borneo's rainforests are older than the Amazon, dating back 140 million years.
Final Thoughts
The world's largest islands are remarkably diverse, from Greenland's ice-covered vastness to Honshu's urban density. Each has been shaped by its unique geography, climate, and isolation into a world unto itself.