There are ferry terminals in Gdansk and Owinoujscie, which from travellers may travel to Copenhag, Ronne, Nynashamn, Ystad.
A return ticket for adult from Owinoujocie to Ystad cost 250 zl (63 Euro) and during the summer months 400 zl (100 Euro).
For more information look in www.polferries.com.pl