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Tsushima Island

Tsushima Island is a Japanese island in the Tsushima Strait between Kyushu and the Korean Peninsula.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Tsushima Island is a Japanese island located in the Tsushima Strait between Kyushu and the Korean Peninsula. It is administered as part of Nagasaki Prefecture, and the name can refer to the wider Tsushima archipelago. The island has historically been a key crossing point between Japan and the Korean Peninsula.

Geography

Tsushima is located in the strait between Japan and Korea and is made up of rugged islands with a mountainous interior. Modern references describe the group as measuring roughly 70 by 15 kilometres, though older sources and different definitions may use broader archipelago measurements.

Administration

Tsushima is part of Nagasaki Prefecture and is administered through Tsushima City. The island is one of Japan's westernmost inhabited areas and functions as a local municipality within the prefectural system.

History

Tsushima has long been significant as a maritime contact zone between Japan and the Korean Peninsula. Historical references note its earlier status as Tsushima Province and later incorporation into Nagasaki Prefecture during the Meiji period.

Cultural and strategic significance

Because of its location, Tsushima has often been described as a gateway island between Japan and mainland Asia. It has appeared in military history, trade, and cross-cultural exchange, including the 1905 Battle of Tsushima in the surrounding waters.

Key facts

  • Tsushima lies between Kyushu and South Korea in the Korea Strait/Tsushima Strait area.
  • The island is administratively part of Nagasaki Prefecture, Japan.
  • The name Tsushima can refer to the main island or the broader Tsushima archipelago.
  • Historical sources describe the island as a key crossing point between Japan and the Korean Peninsula.
  • Tsushima City encompasses the island and nearby smaller islands.

Frequently asked questions

Where is Tsushima Island located?
It lies between Kyushu and the Korean Peninsula in the Tsushima Strait/Korea Strait area.
Is Tsushima Island part of Japan?
Yes. It is administered as part of Nagasaki Prefecture in Japan.
What is Tsushima City?
Tsushima City is the municipality that covers Tsushima Island and nearby smaller islands.
Why is Tsushima historically important?
Its location made it an important route for travel, trade, and military activity between Japan and Korea.
How big is Tsushima Island?
Modern sources describe the island group as about 70 by 15 kilometres, while the broader archipelago definition varies by source.

References

  1. Wikipediahttps://en.wikipedia.org/wiki/Tsushima_Island
    Supports: Location, administrative status, size, population, historical canal divisions, and general naming of the island group
  2. Encyclopaedia Britannicahttps://www.britannica.com/place/Tsushima
    Supports: Geographic location, archipelago description, separation into Kami and Shimo islands, and historical significance
  3. Wikipediahttps://en.wikipedia.org/wiki/Tsushima,_Nagasaki
    Supports: Tsushima City covering the island and nearby islands
  4. Discover Nagasakihttps://www.discover-nagasaki.com/en/featured-topics/about-tsushima
    Supports: Island description, mountainous terrain, gateway role, and historical significance
  5. Wikipediahttps://en.wikipedia.org/wiki/Tsushima
    Supports: Historical references including Tsushima Province and Battle of Tsushima