By Ferry from Thira to Ios

A beautiful ferry voyage from the caldera within Thira, also known as Santorini, to Ios. The caldera was formed around 1600 BCE in one of the largest volcanic events in history. About 100 cubic kilometers of magma, rock, and ash were expelled and the sea rushed in. The caldera is now about 11 by 8 kilometers, and up to 400 meters deep. The crossing to Ios take about an hour, best done on a ferry…