An oblong island with a precipitous northwestern coastline, and a hilly landscape. The inhabitants work in the fields on the small but fertile plains, or else are shepherds and seamen. The centre of the island has submerged, leaving two small islets and several smaller ones still. A rock mass called Psathoura is all that remains of ancient Alonnisos.

Exploring... :  
The sea round Alonnisos has been declared as a "Marine conservation Park" where all human intervention is forbidden. The best way of getting about is by motor boats. These ply between the islands and the various beaches and excursion sites.

Beaches:
Kokkinokastro, 30 min. by caique from Patitiri, the small port of Alonnisos. Hrissi Milia, Steni Vala, Kalamakia, Agios Dimitrios offer excellent bathing. On some of the surrounding, virtually uninhabited isles there are isolated, good beaches but no amenities.

Antiquites:
At Kokkinokastro can be seen the remains of the ancient city walls, pot shards, tombstones and graves. It is thought that this is the site of ancient Ikos. At Ai-Dimitris there are ruins of an unknown ancient city, and at Agios Petros there is a sunken byzantine ship (1200 A.D.).On the island of Gioura you will find Cyclop's Cave, decorated with varicoloured stalactites and stalagmites. Psathoura has remains of an ancient city, most of which lie submerged. The light-house on rocky Psathoura is one of the most powerful of the Aegean Sea.