Poros Island, the Argosaronic.
180 20 Póros (ancient name, Calauria or Kalaureia): area 22sq. km; perimeter 42km; resident population 4,182; max. altitude 358 m. Port Authority: 22980 22274. Travel information: Saronic Gulf Travel, T. 22980 24800, fax 24802, www.saronicgulftravel.gr