CruiseStar
"Cruise" covers two genuinely different vacations: ocean cruising on a large ship crossing open water between ports, and river cruising on a smaller vessel moving slowly through inland waterways, usually through Europe or similar river systems. Confusing the two before booking is one of the most common first-timer mistakes.
Scale changes everything else
An ocean ship can carry anywhere from a few hundred to over seven thousand passengers, with multiple pools, theaters, and dining venues built so the ship itself is part of the vacation. A river ship typically carries somewhere between 100 and 200 passengers, with one dining room and a far quieter, more intimate feel, the ship is the transportation, not the destination. That difference in scale is also why ocean ships come loaded with waterslides, rock climbing walls, casinos, and dozens of dining venues, while river ships lean on destination lectures and a single lounge, because the itinerary's ports and included excursions are the real draw rather than the ship's own entertainment. The cruise ship fleet statistics break the oceangoing fleet into small, midsize, and large-ship capacity bands.
The itinerary rhythm is completely different too
Ocean cruises typically build in one or more full sea days between ports, giving you time to actually use all that onboard amenity. River cruises almost never have a true sea day at all, the ship docks in a new town most mornings, sails a few hours in the afternoon or overnight, and arrives at the next port by the next day, so nearly the whole trip plays out in destinations rather than at sea. That's also part of why river cruising tends to cost more per night: fares typically bundle in most excursions, Wi-Fi, and sometimes drinks, reflecting a smaller ship's higher staff-to-guest ratio. Ocean cruising can be booked far cheaper at the base fare, though add-ons like specialty dining and drink packages narrow that gap depending on how much you use them.
Which one fits a first cruise better
Most first-timers start with ocean cruising because it's more forgiving of a group with mixed interests, someone who wants to park by the pool and someone who wants to explore every port can both be happy on the same ship. River cruising rewards travelers who already know they want a slower, more destination-focused week with fewer onboard distractions pulling their attention.
How this shapes CruiseStar's catalog
The catalog is built from open ship identity data, which naturally pulls in ferries, riverboats, and museum ships alongside genuine ocean cruise vessels. Since CruiseStar leads with ocean cruising, those other vessel types sort below the main fleet and stay out of featured rows on Home, ship search, and cruise line pages, so a historic liner or a ferry with a confusing operator name doesn't show up looking like a current cruise product. If a ship you're looking for is missing entirely, it's usually because its identity data is still incomplete, a temporary IMO-only title, a missing Wikipedia page, or an operator string that doesn't cleanly match a known line, and that matching keeps getting refined so the live fleet reflects ships people can actually sail today.
Because river passengers are excluded from most oceangoing totals, keep the scope in mind when quoting our cruise industry statistics.