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

agia marina petrified forest turquoise water beach southern greece coastal beauty natural attractions scenic landscape nature hike geology vacation spot travel destination relaxation outdoor activities snorkeling swimming crystal clear rocky cliffs mediterranean coast sandy hiking trails summer getaway eco tourism wildlife sunbathing family friendly clean pristine environment unique ecosystem geological