Outside Ayia Kyriaki, near the airport and the fishing retreat of Almyrida, there are thermal springs in the sea, rated as moderately radioactive (source: Voreadis, 1965).
Locals have placed a little wall around the springs to make something like a mini-pool and erected a simple changing cabin for users. Two people at a time fit comfortably into the pool.
Access to the area is free. Located below the main asphalt the spot is easily reached down a rough track on foot, by bicycle or car, which can be parked nearby. It’s close to the airport.