Turku ferry terminal is 132 km east of Mariehamn. This corresponds to a distance of 71 nautical miles.
The ferry port of Turku connects Finland with Sweden and Åland. The routes Turku - Mariehamn, Turku - Kapellskär, Turku - Langnäs and Turku - Stockholm are offered here several times a day by the shipping companies Viking Line and Tallink & Silja Line.