Thirasia Island

Thirasia is the quiet twin of Santorini, separated from it by a violent volcanic event rather than by original design. Both islands were once a single landmass until the Late Bronze Age Thera eruption, one of the largest volcanic events in recorded history, blew out the caldera and split the rim into the crescent of islands seen today. Thirasia occupies the northwestern arc of that crescent, directly across the water from Santorini's cliffside towns, and its black volcanic cliffs and pumice-streaked slopes tell the same geological story without the crowds.

The island is small, covering roughly 9.3 square kilometres, and sparsely populated: the 2021 census recorded just 249 residents spread across five tiny settlements. Manolas, perched on the caldera rim, is the largest of these and serves as the island's de facto capital, with Potamos, Agia Eirini, Agrilia and Ormos Korfou making up the rest. Administratively, Thirasia falls under the municipal unit of Oia, and its way of life still revolves around small-scale farming and fishing rather than tourism infrastructure.

For sailors, Thirasia's appeal is precisely its lack of development. The caldera-side coast offers deep, sheltered water close to shore, and the island is a natural add-on to any itinerary built around Santorini; many charter guests exploring Greece anchor here for the afternoon before crossing back to the busier side of the caldera. A short climb from the small port of Korfos up to Manolas rewards the effort with uninterrupted views over the volcano and the sea beyond.