Ōshū Kaidō
What eventually became National Route 7 between Aburakawa-juku in present-day Aomori and Tsuchizakiminato-juku in Akita was established during the Edo period by Tokugawa Ieyasu as the Ushū Hama Kaidō and Ushū Kaidō, subroutes of the Ōshū Kaidō.