Thasos or Thassos (Greek: Θάσος) is a Greek island in the northern Aegean Sea, close to the coast of Thrace. It is the northernmost Greek island, and 12th largest by area. More: http://en.wikipedia.org/wiki/Thasos
On the beautiful island of Thassos, Greece lies a secluded lagoon near the village of Astris called Giola. This seaside gem is apparently quite a trek, but for those willing to make the journey, they are rewarded with an incredible natural pool to so.