Aki Strait

The Aki Strait (秋海峡) is a between the Naichi archipelago islands of Ōshima in the north and Harukuni in the south. It links the Varunan Ocean in the west and the Hokkai Sea in the north-east. There are seven major islands and 83 minor islands within the Aki Strait. As the crossroads between two of the largest islands in Yamatai, the Aki strait is extremely important to transportation in this part of the country.

Historically, the Aki Strait has also been known as the Aki Inland Sea, after the Haru Inland Sea between Harukuni and Akitsukuni in the east. In 1856, the government officially declared the official name of the water body to be the Aki Strait.

Twelve major bridges and several ferry services connect Ōshima and Harukuni, and both shores of the strait are heavily developed, with six major cities and several other cities on the shores of the strait.