Polichnitos Hot Springs

The Polichnitos hot springs reach a temperature of 87,6οC, making it the warmest natural spring in Europe. The hot water circulating underground approaches 400οC. These springs gush up through ignimbrites which are the most recent volcanic rocks on Lesvos.

The hot springs of Polichnitos are rich in sodium chloride. In comparison with seawater however, the springs contain 3 times less sodium chloride. It is believed there is some seawater intrusion into the springs, approximately 30%.

The rocks where the hot springs well up feature shades of red and yellow due to deposits of iron oxide such as limonite and hematite.