Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

agios nikolaos agia marina geopark petrified forest beach turquoise water southern greece coastal rocks natural beauty clear landscape tourism summer vacation seaside sunshine outdoor activity nature relaxation holiday pristine scenery tranquility geological formation marine life adventure exploration crystal warm climate shoreline scenic view quiet spot hidden gems travel destination local