Milos is the southwesternmost island in the Cyclades group, 120 km (75 miles) due east from the coast of Laconia. From east to west it measures about 23 km (14 mi), from north to south 13 km (8 mi), and its area is estimated at 151 km² (58.3 mi²). The greater portion is rugged and hilly, culminating in Mount Profitis Elias 748 m (2,454 ft) in the west. Like the rest of the cluster, the island is of volcanic origin, with tuff, trachyte and obsidian among its ordinary rocks. The natural harbour is the hollow of the principal crater, which, with a depth diminishing from 70 to 30 fathoms (130–55 m), strikes in from the northwest so as to separate the island into two fairly equal portions (see photo), with an isthmus not more than 18 km (11 miles) broad. In one of the caves on the south coast, the heat from the volcano is still great, and on the eastern shore of the harbour, there are hot sulphurous springs. Antimelos or Antimilos, 13 miles (20 km) north-west of Milos, is an uninhabited mass of trachyte, often called Erimomilos (Desert Milos). Kimolos, or Argentiera, 1.6 km (1 mi) to the north-east, was famous in antiquity for its figs and fuller's earth, and contained a considerable city, the remains of which cover the cliff of St. Andrew's. Polyaigos (also called Polinos, Polybos or Polivo — alternative spelling Polyaegos) lies 2 km south-east of Kimolos. It was the subject of dispute between the Milians and Kimolians. It is now uninhabited.