Thirassia Island

Thirassia Island is the quieter inhabited island across the caldera from Santorini, often described as a glimpse of what the Santorini area felt like before mass tourism. It is small, low-key, and far less polished than the main island, which is exactly why many travelers find it so appealing. If you want a caldera day trip that feels slower, more local, and much less crowded, Thirassia is one of the best add-ons to a Santorini stay.

Thirassia is not uninhabited. The Santorini Port Authority guide lists an area of 9.246 sq km, a population of 319 in the 2011 census, and identifies Manolas as the capital and Riva as the main port. That matters because the island is best understood not as an empty excursion stop, but as a small living community with villages, tavernas, and walking routes.

Why Thirassia is worth visiting

The biggest draw is contrast. From Santorini, you already know the caldera as a dramatic, heavily visited destination. On Thirassia, the same volcanic setting feels more spacious, less commercial, and more grounded in village life. The Port Authority guide highlights the island’s natural relief, traditional architecture, picturesque coastline, and views toward Santorini, Palaia Kameni, and Nea Kameni. Discover Greece also positions Thirassia as a chance to see a more old-fashioned side of the caldera area.

How to get there

Current public guidance from Discover Greece says boats for Riva and Korfos leave from Ammoudi in Oia at various times of day, and ferries for Riva also depart from Athinio on most days of the week. It also notes that there is a bus connection between Riva and Manolas, and that crossings depend on weather conditions. Many travelers now visit Thirassia as part of a combined volcano-and-hot-springs itinerary, which is why your best Santorini boat tours, best tours in Santorini, and Santorini sunset cruise guide are the strongest internal pairings for this page.

What to do on the island

Most visitors keep it simple: arrive at the port, go up toward Manolas for the caldera views, eat in a taverna, and enjoy the slower pace. Discover Greece also highlights Agrilia, the island’s oldest settlement, as a more rugged walking destination reached by a roughly 2 km walk from Manolas. Thirassia is not about packed sightseeing lists. It is about slowing down and seeing the caldera from a different rhythm.

Who it suits best

Thirassia is best for repeat visitors, quieter day trips, photographers, walkers, and travelers who want something more traditional than the main Santorini circuit. It also works well for anyone already interested in the volcano and hot springs, because many of the most practical ways to reach it are by boat tours that combine all three.

Local tip: Do not expect full resort infrastructure. Thirassia works best when you treat it as a slower island detour with simple pleasures: a boat ride, a village walk, a long lunch, and a different perspective on the caldera.