The Seto Inland Sea didn't exist yet and Honshu, Shikoku, Kyushu, Tanegashima Island, Yakushima Island, and Tsushima Island were connected and existed as one big island.
瀬戸内海はまだ存在しておらず、本州、四国、九州、種子島、屋久島、対馬列島は一つの大きな島となっていた。