A small distance from Agios Kirikos lies the small village of Therma, with its world famous therapeutic radioactive hot mineral springs.
The sources in the coasts of Therma were known since ancient times. Their uniqueness and the therapeutic attributes of the water made the island famous. In the decade of 1920 began an extensive exploitation of the hot springs and until 1940 several hotels and enterprises that were related to the operation of baths prospered. During World War II and later years of infight the springs stopped their operation. In newer years, there have been made efforts of resurgence of therapeutic tourism and the medical attributes of the springs were evaluated scientifically.
The hot springs of Ikaria present exceptional interest, they are in the category of "alipigon" radioactive. The most radioactive are the springs of Artemis (754 Mache, 50,4°C), Apollo (557 Mache, 45,4°C), Mustafa-Litza (350 Mache, 43°C), Kratsa (240 Mache, 46,8°C) etc. Hotter than all others (58,7°C), but poorer in radioactivity (8,2 - 9 Mache) is the spring of Therme. In the region there have been found ruins from ancient baths.