Thasos or Thassos, visible in the lower left quadrant of this orthorectified image, is a Greek island in the northern Aegean Sea, close to the coast of Thrace and the plain of the river Nestos but geographically part of Macedonia. It is the northernmost Greek island.
Thasos has a generally round shape, without deep bays and significant peninsulas. The highest peak, Ypsario or Ipsario, is 1,205 m (3428 ft) high and lies in the eastern half of the island, which is steeper and mostly covered in pine forest. The western half has gentler slopes. While generally mountainous, the terrain is not particularly rugged, as it rises gradually from the coast towards the island center.