Stromma sails 10 routes between 25 ports in Sweden, mostly Stockholm, Fjäderholmarna and Stockholm Klara Mälarstrand. From Stockholm: Fjäderholmarna, Sandhamn, Vaxholm and 10 other ports. From Stockholm Klara Mälarstrand: Drottningholm, Birka, Jungfrusund, Nya Kungshatt and Vårby. From Gothenburg: Nya Älvsborg and Vinga. From Uppsala: Skokloster.