AND EVEN LONGER THAN THAT: Viking

Countries visited: 59 Ports visited: 113 Islands visited: 21 Nights in port: 22

Viking is a long-established luxury rivercruise operator but has now entered the world of ocean cruising — and entered with a bang.

It’s with some justification that it calls its world cruise, aboard the 930-passenger Viking Sun, the Ultimate World Cruise, because at 243 days (eight months) it’s the longest available in 2019. The itinerary is