Viking River Cruises has by far the largest fleet of the major river lines, and 40 (and counting) of those vessels are Viking Longships. All named for Norse gods and heroes, these ships sail Europe’s most scenic waterways — the Danube, the Rhine, the Seine, the Main — and each holds 190 passengers in 95 staterooms and suites. Fortunately, selecting a cabin is much easier here than on mainstream ocean-going ships. To help, we've decoded the deck plans. Check out our video guide to the ships’ accommodations to see which category is right for you.