Loutra is one of the most famous villages of Kythnos. Its name means baths because of the thermal baths of the area. Loutra is a small village, but every year many visitors arrive to cure their diseases. The temperature of the water is about 45°C. Visitors, also have to visit the nearby Agia Eirini bay, where the warm water from springs ends. At the area there are some restaurants and clubs.