Viking River Cruises, a Boston, MA based firm, operates a fleet of 18 river cruising vessels along the rivers of Europe, Russia, Ukraine and China. Viking cruises range from 8 to 17 days along Europe’s Rhine, Main, Danube, Seine, Saône, Rhône, and Elbe Rivers; Russia’s Volga and Svir; Ukraine's Dnieper and China’s Yangtze. The ships have an average capacity of approximately 170 passengers. The cruises are marketed as being unique from other tours in that they provide vacationers a chance to see the best of big cities and villages, in a relaxing, affordable and scenic mode of travel.