Paros is located at co-ordinates 37° N. lat, and 25° 10′ E. long. The island is 165 km2 (64 sq mi). Paros’ maximum length from N.E. to S.W. is 13 mi (21 km), and its greatest breadth 10 mi (16 km). The island is of a round, plump-pear shape, formed by a single mountain (724 m (2,375 ft)) sloping evenly down on all sides to a maritime plain, which is broadest on the north-east and south-west sides. The island is primarily composed of marble, although gneiss and mica-schist are also present. To the west of Paros lies its smaller sister island Antiparos. At its narrowest, the channel between the two islands is less than 2 km wide. A car-carrying shuttle-ferry operates all day (to and from Pounda, 3 miles south of Parikia). In addition a dozen smaller islets surround Paros. Paros has numerous beaches including Chrissí Aktí (Golden Beach) on the east coast, Pounda, Logaras, Piso Livadi, Naousa Bay, Parikia and Agia Irini. The near-constant strong wind in the strait between Paros and Paros makes it an ideal windsurfing location.