Schools will be closed Monday on the iconic Greek island of Santorini after a series of 200 earthquakes shook the popular tourist destination in recent days.

Tremors between Santorini and Amorgos since Friday led to school closures in Santorini, Ios, Amorgos, and Anafi, as authorities monitor the seismic activity.

Crescent-shaped Santorini is a premier tourism destination with daily arrivals via commercial flights, ferries, and cruise ships. The island draws more than three million visitors annually to its whitewashed villages, built along dramatic cliffs formed by a massive volcanic eruption more than 3,500 years ago.