Indonesia vs Japan

Indonesia is 5.0 times larger than Japan — 1,904,569 against 377,915 km². Indonesia is 2.3 times more populous than Japan — 285,721,236 against 123,366,734 people.

Side by side

Population density

Japan is 2.2 times more densely populated than Indonesia — 326 against 150 people per km². Density is where area and population interact, and it often reverses the impression the headline figures give — a large country with a small population can feel emptier than a small crowded one by an enormous margin.

Practical differences

• Different currencies: the Indonesian rupiah and the Japanese yen.
• Indonesia spans 3 time zones, so "local time" there is not a single answer.

Indonesia

The largest archipelago in the world: official surveys count more than 17,000 islands, of which around 6,000 are inhabited, spread over 5,100 km of ocean. Indonesia sits on the Pacific Ring of Fire and has about 130 active volcanoes, more than any other country. It also holds more of the world's remaining tropical peatland than anywhere except the Congo basin.

Japan

A 2023 government survey using digital mapping counted 14,125 islands, more than double the long-quoted figure of 6,852. About three-quarters of the land is mountain, so nearly everyone lives on a narrow band of coastal plain. Japan sits where four tectonic plates meet and records a fifth of the world's magnitude-6-and-above earthquakes.

Neutral facts only. Nothing here addresses politics, government, economics or which country is preferable in any respect — population is the one figure that dates, and it carries its year.