There are 51 ocean cruise lines and 27 river cruise lines. Cruise lines are either for sea or river, and distinct from passenger lines, which only transport passengers.   Cruise lines provide entertainment, food, tours, etc.   They carried 31.7 million passengers in 2023. 18 million from North America. 7.7 million from Western Europe. 35.7 million total expected in 2024. Other fast-facts. Global economic impact in 2019 = $154.5 billion. 34% of all passengers in the Caribbean and 18% in the Meditarranean. Largest ports in million passengers per year. Miami  5.1 Port Canaveral  4.3 Cozumel  3.9 Port Everglades  3.5 Nassau  3.3 Shanghai  3.3 Barcelona  2.5 Civitacchia  2.4 Pursuing net zero carbon emissions by 2050. 47,000 travel agent members. #1 is Carnival Corporation, operating over 100 ships under this name, plus Holland American, Princess, Seabourn, P&O, Costa Cruises and Aida.  Carries 42% of all cruise passengers, with 37.1% of total revenues. #2 is Royal Caribbean Group, 23.6