Helsingor, Denmark <-> Helsingborg, Sweden
Rodby, Denmark <-> Puttgarten, Germany
Copenhagen, Denmark <-> Malmo, Sweden
Stockholm, Sweden <-> Helsinki, Finland
Stockholm, Sweden <-> Turku, Finland
Helsinki, Finland <-> Tallinn, Estonia
Helsinki, Finland <-> Travemunde, Germany
Helsinki, Finland <-> Leningrad, USSR
Hollyhead, UK <-> Dublin, Ireland
Liverpool, UK -> Dublin, Ireland
Ostend, Belgium -> Dover, UK
Calais, France -> Dover, UK
Rosslare, Ireland -> some forgotten place in France
Ayamonte, Spain -> Vila Real de Santo Antonio, Portugal