What counts as an island nation?

An island nation is a sovereign country whose entire territory consists of one or more islands, with no mainland borders. The list covers single-island states such as Sri Lanka and archipelagos such as Indonesia and the Philippines.

Which is the largest island country?

By land area Indonesia is the largest island country, spanning more than 17,000 islands. By population Indonesia is also the largest, with over 270 million people, far ahead of any other island state.

Which is the smallest island nation?

Nauru is the smallest island country by area at about 21 square kilometres, and the Maldives and several Pacific microstates are among the smallest by both area and population. These tiny states are highly exposed to sea-level rise.

Is Australia an island country?

Geographically Australia is the world's largest island and a continent, but it is usually classed as a continental country rather than an island nation. This reference focuses on smaller states whose identity is defined by being islands.

Why group island nations by ocean?

The ocean basin shapes a country's climate, trade routes, and regional groupings. Pacific island states share regional bodies and climate concerns, while Caribbean nations share the Atlantic basin and similar tourism economies.

Island Nations Reference

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Island nations are sovereign states made up entirely of islands, with no land border to a continent. This reference lists island and archipelago countries with their ocean basin, land area, population, and capital, so you can compare them side by side.

How it works

A country qualifies as an island nation when all of its territory is islands. That spans two shapes:

Single-island states such as Sri Lanka, Cuba, or Iceland.
Archipelago states such as Indonesia, the Philippines, and Japan, made up of many islands.

Each entry records the ocean basin (Pacific, Atlantic, Indian, or a regional sea), the land area in square kilometres, the population, and the capital, letting you compare scale from giant Indonesia down to microstates like Nauru.

Tips and notes

Australia is geographically the largest island but is usually treated as a continental country, so this list focuses on smaller states whose identity is defined by being islands. Grouping by ocean is useful because basins map onto shared climate, trade routes, and regional bodies — Pacific states cluster around common climate concerns, Caribbean nations around tourism economies. Many small island states are acutely exposed to sea-level rise.