Japan’s total area is about 378,000 square kilometers (around 146,000 square miles), making it a mid-sized country, a bit larger than Germany and a little smaller than the U.S. state of California.

Basic size facts

  • Japan’s territory covers roughly 378,000 square kilometers in total.
  • In square miles, that’s about 145,000–146,000 square miles.
  • The islands stretch about 3,000 kilometers (around 1,900 miles) from north to south, so the country is long and narrow rather than compact.

How that compares

  • Japan is about one twenty-fifth the size of the United States and a little smaller than California by land area.
  • It is slightly larger than Germany in surface area, even though people often imagine it as much smaller on many world maps.

What makes up that area

  • Japan consists of four main islands—Hokkaido, Honshu, Shikoku, and Kyushu—plus over 6,800 smaller islands.
  • Honshu alone accounts for about 61% of the country’s land, with Hokkaido, Kyushu, and Shikoku making up most of the rest.

Land vs. water and shape

  • Of the total area, about 364,000 square kilometers is land, with the rest counted as inland water.
  • Much of that land is mountainous, so the flat, heavily populated plains (like the Kanto Plain around Tokyo) occupy only a smaller share of the total area.

Quick comparison table

[3][5][1] [5] [7]
Place Approx. area Relation to Japan
Japan ≈378,000 km² Reference
California (USA) Similar size Japan is a little smaller
Germany Slightly smaller area Japan is a bit larger
Information gathered from public forums or data available on the internet and portrayed here.