amsterdam to the black sea (2028) amsterdam to bucharest | 30 days in 1992, the main-danube canal was built, paving the way for uniworld to offer the first cruises that sailed all the way from amsterdam to the black sea. join us in returning to our roots as we... ship: s.s. helen countries: austria, bulgaria, croatia, germany, hungary, netherlands, romania, serbia, slovakia rivers: danube, main, rhine from $15,599* per person based on double occupancy. *from price based on may 20, 2028 itinerary. available on a limited number of staterooms. single supplement applies. view itinerary dates & pricing