This view illustrates the center of Santorini Volcano, located approximately 120 km (75 mi) north of Crete in the Aegean Sea. One of the largest volcanic eruptions in the past 10,000 years occurred approximately 1630 B.C. on this island. The cataclysm created the present-day islands and caldera bay of Santorini Volcano. The caldera rim is clearly visible in this image as a steep cliff forming the western shoreline of the island of Thera, the largest of the remnant islands. The white rooftops of cities and towns also help trace the caldera rim. Image courtesy of NASA.