What nation is Rotterdam the world's busiest seaport in?
Rotterdam is in the Kingdom of the Netherlands.
Atlanta-Hartsfield Jackson International Airport is the world's busiest airport both in terms of passengers as well as departures and landings. Some 89 million passengers passed through it's terminals in 2007. Hartsfield-Jackson Atlanta International Airport Atlanta, Georgia, United States is the worlds busiest airport. If you click on 'related links' below the link will take you to a list of the worlds busiest airports.