After crossing the sea, the Tokaido ran north along the Boso Peninsula, went through Hitachi-no-kuni and the Kikuta-no-seki checkpoint into Mutsu-no-kuni, and merged with the Tozando in what is now Miyagi Prefecture.
海を渡ってから房総半島を北上し、常陸国から菊多関を経由して陸奥国に入り、今の宮城県南部で東山道に合する。