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

petrified forest agia marina geosites turquoise water coastline southern greece natural beauty rock formations hiking outdoor adventure scenic view beach erosion biodiversity geotourism mediterranean vacation nature cliffs geology summer travel exploration culture pristine relaxation geological site marine life landscape tourism picturesque secluded sun recreation features azure sea environment heritage park