Ghost of Tsushima Wiki Answers

Where is the island of Tsushima?

The Island of Tsushima is located between the two countries Korea and Japan, as shown in the map below. As Korea became a vassal of the Mongol Empire under Kublai Kahn, it was used as a launching pad for the invasions to Japan.

And as Tsushima is the first island to be reached, it was occupied and used as a resting spot for the warships, before they sailed to Hakata Bay, where the first major battles really occurred.