The act of circumnavigating, or sailing round.

traveling around something (by ship or plane); "Magellan's circumnavigation of the earth proved that it is a globe"

To circumnavigate a place, such as an island, a continent, or the Earth, is to travel all the way around it by boat or ship. More recently, the term has also been used to cover aerial round-the-world flights.

a memorable experience, but a serious undertaking