| Official Name | Thira (Θήρα) — Santorini is the Venetian name |
| Status | Cycladic island, South Aegean, Greece |
| Area | 76 km² (main island Thira), with islets about 90 km² |
| Population | approx. 15,500 (up to 70,000 with tourists in summer) |
| Main Town | Fira (Thira), approx. 2,500 inhabitants |
| Language | Greek (English widely spoken) |
| Currency | Euro (€) |
| Time Zone | CET+1 (UTC+2), Daylight Saving Time CET+2 |
| Electricity | 230V, Type C/F — German plugs fit |
| Drinking Water | Do not drink from the tap! Desalinated water — buy bottled water |
| Religion | Greek Orthodox (over 95%) |
| Highest Point | Profitis Ilias (567 m) |
| Visa | EU/Schengen — no visa required for EU citizens |
| Airport | Santorini/Thira (JTR) |
| Ferry Port | Athinios (main port) and old port Fira (tender boats) |
