Therasia can be considered the “quiet sister” of Santorini — a truly small island, about 9.3 square kilometers in size, with very few inhabitants, where rural life and fishing still follow their authentic, traditional rhythms.
The whitewashed villages of Manolas, Potamos, and Agrilia overlook the caldera, offering spectacular views framed by vine-covered terraces, gardens, and small tavernas.
Geologically, Therasia is part of the Santorini volcanic complex. The great eruption of the 16th century B.C. reshaped the caldera, separating Thera and Therasia and creating the natural amphitheater we admire today.
Compared to Santorini, tourism here is much quieter, and the atmosphere more intimate. Visitors stroll through peaceful alleys, Cycladic chapels, and scenic trails overlooking Aspronisi, Nea Kameni, and Palaia Kameni. The main settlement, Manolas, stands high above the sea, while below it, the small port of Korfos is reached by a steep path. Riva serves as the island’s main harbor for local ferries and boats arriving from Ammoudi (Oia) and Athinios.
For those seeking a swim, the island offers several small beaches and rocky coves — simple, unspoiled spots that are perfect for anyone in search of clear water and tranquility.
Let me leave you with an interesting fact: Therasia is considered one of the most geologically stable parts of the caldera. Scientists use it as a reference point to monitor the movements of Santorini’s volcano, as its rock formations record, over time, even the slightest uplifts or deformations of the ground.
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