At a distance of 13 km south west of Ermoupolis, between the beach resorts of Megas Gialos and Finikas, is the organized beach of Possidonia (or Poseidonia). The beach of Possidonia in Syros is a nice bay with sandy seashore and some trees that provide natural shade to visitors. Part of the Possidonia beach in Syros is organized with sun beds and umbrellas, while the rest of the beach is unorganized and calm.
Along the beach road of Possidonia are taverns with delicious food, cafeterias and few beach studios Other studios in Possidonia beach are found in the inner streets, just few minutes walk away from the shore. Just opposite the beach of Possidonia are the two small islets of Strogylo and Schinonissi.