How it works Try a lens The library Explore Get started FAQ Download on the App Store →

COUNTRIES

Tonga: map, flag, capital and key facts

Tonga is a country in Oceania, with about 104,000 people (2025) and an area of 750 square kilometres. Its capital is Nuku'alofa, and it has no land borders.

By Team Geography Last reviewed

Flag of Tonga
Flag of Tonga
Map showing where the country sits among its neighbours
Tonga in solid, land neighbours outlined, capital marked.

Key facts about Tonga

CapitalNuku'alofa
ContinentOceania
Population103,742 2025, World Bank. 182nd of 195.
Area750 km² (290 sq mi) World Bank, surface area. 175th largest of 195.
Population density138 people per km²
Land neighboursNone. It has no land borders with another country.
Official nameKingdom of Tonga
UN statusMember state
Capital coordinates21.14° S, 175.22° W Nuku'alofa, Natural Earth.

No land borders

Tonga shares no land border with another country. Its nearest neighbours are across the sea, as the map above shows.

From the Geography app

The app teaches each country through short hand written lenses: PLACE for physical geography, STORY for history and identity, NOW for the news, and THREAD for the ties between countries. Here is one of Tonga's 5, in full.

PLACELens 1 of 5

A kingdom above one of the deepest ocean trenches

Tonga is an archipelago of 171 islands, 36 of them inhabited, spread across 700,000 square kilometers of the South Pacific. The total land area is only 747 square kilometers. To the east lies the Tonga Trench, plunging to 10,882 meters, one of the deepest points in the ocean. The islands divide into three groups: Tongatapu in the south (where the capital Nuku'alofa sits), Ha'apai in the center, and Vava'u in the north.

More on Tonga Trench

The Tonga Trench runs for about 2,500 kilometers along the boundary of the Pacific and Australian tectonic plates. Its extreme depth, second only to the Mariana Trench in the Pacific, makes it a subject of intense scientific interest in deep-sea biology and plate tectonics.

4 more lenses on Tonga in the app

  • STORY The only Pacific monarchy that was never colonized
  • NOW The eruption that sent a shockwave around the planet
  • STORY Church, rugby, and the Sunday that nothing interrupts
  • THREAD A small kingdom in a large-power ocean

Titles only. The app brings each lens back on a spaced repetition schedule set by how well you knew it: New, Hazy or Clear.

Compare Tonga with another country

Opens the country comparison tool with population, area, income and more side by side, every figure dated.

Common questions

What is the capital of Tonga?
The capital of Tonga is Nuku'alofa. Nuku'alofa lies at about 21.1 degrees south and 175.2 degrees west. Tonga is in Oceania. It is home to about 104,000 people. The world capitals quiz on this site tests every capital, and the printable capitals sheets cover each continent.
What is the population of Tonga?
About 104,000 people live in Tonga, according to the World Bank figures for 2025. That makes it the 182nd most populous of the 195 countries. With an area of 750 square kilometres, that is about 138 people per square kilometre.
What countries border Tonga?
None. Tonga has no land borders with any other country. It is surrounded by sea, so every neighbour of Tonga is across the water. It lies in Oceania. Its area is 750 square kilometres, and about 104,000 people live there.
How big is Tonga?
Tonga covers 750 square kilometres, or about 290 square miles. That makes it the 175th largest of the 195 countries. The figure is total surface area, which includes inland water such as lakes and rivers. Its population of about 104,000 gives a density of 138 people per square kilometre.

Keep exploring