In ancient times, the Tsugaru Straits were located around Ezo (the Early Modern Japanese to describe the island of Hokkaido and the people who lived there) (it refers to `Tsugaru,' `Ara-Emishi,' `Niki-Emishi' in "Shin To-jo" (New Book of Tang).
古代において津軽海峡は蝦夷国（『新唐書』における、「都加留（つがる）」、「麁蝦夷（あらえみし）」、「熟蝦夷（にきえみし）」）にあった。