Thassos, "emerald island", is located in the Gulf of Kavala, in northern Aegean Sea and is closest to mainland Greece (8 km).
Thassos is not too much distance Keramoti Nestos river and estuary. In its most stretched from the island measures 22 km from east to west and 26 km from north to south. It has a circumference of about 100 km, being smaller than and greater than Samotraki Rhodes.
