King's Road (Finnish: Kuninkaantie, Swedish: Kungsvägen) is an old mailing route in Northern Europe dating back to the 14th century, starting from Bergen in Norway on the Atlantic coast, passing through the capitals of Norway and Sweden (Oslo and Stockholm) crossing the sea through the Åland archipelago to Turku in SW Finland and ending up in Vyborg in Russia.
Map of Kuninkaantie, 49510 Hamina, Finland
The modern tourist route "King's Road" is extended to St. Petersburg.
References
King's Road (Finland) Wikipedia(Text) CC BY-SA