There is an island about 40 ri north of the west island of Matsushima in Oki county. It is called Takeshima. This island is close to Japan and next to Joseon and is shaped like a triangle. It's circumference is about 15 ri.
The distance from Hakushu's Yonago to Takeshima is about 160 ri by sea. One should go from Yonago to Izumo, and then through Oki’s Matsushima to get to Takeshima. They say that the distance from Oki’s Fukushima to Matsushima is 60 ri by sea, and from Matsushima to Takeshima is 40 ri.
The above information is from documents written when Yonago residents Kyuemon Oya and Ichibee Murakawa replied to questions by the government in 1724.