Scattered volcanic activity has been recorded in the Hellenic territory for a period between 6 and 0.5 million years. Such activity is concentrated at the western shores of Pagasitikos gulf and at the Northern Euboikos gulf (Achilleio, Porfyrio, Mikrothives, Lichades, Ag. Ioannis), at the Voras massif (Almopia), at the Strymonikos region (Strymoniko, Didymoi Lofoi (Twin Hills), Gavra, Ankistro),Antiparos and at the rocky islet Psathoura.