In Palea Kameni Island, near the church of Agios Nikolaos, the sea turns from blue, into green and then into brown. The cause is the sulfur, a yellow substance, coming out of the hot springs. The water near the springs can reach 33 Celsius and people come with small boats from the main island to swim to the muddy beach. Sulfur is very beneficial for the skin as it can help with many skin conditions and allergies while you can find it in many cosmetics and soaps. If you visit the hot springs remember not to wear a white swimming suit as it will be probably ruined by the sulfur.
Photo taken at Palea Kameni