The Greek island of Mykonos is situated in the center of the Aegean Sea 150 kilometers east of Athens and is part of the group of islands known as the Cyclades. Although it is the most famous of this group it is actually the smallest covering an area of just 90 square kilometers. Its rocky terrain rises from the sea to form gentle hills and small valleys with the two highest points being small mountains of 369 and 392 meters in elevation. The islands geologic makeup is that of granite which in some areas has been carved into interesting forms through the erosive action of  wind, sea and sun. In previous years deposits of high quality clay and barite, a mineral used as a lubricant in the oil drilling process, were once extensively mined. There are no rivers to speak of but of its many seasonal streams two have been harnessed by dams to create sizable reservoirs. Despite its small area, part of Mykonos' fame comes from the fact that it has over twenty accessible sandy beaches earning the name "Capri of Greece". The main town or "Hora" is situated on the west coast of the island with the smaller village of Ano Mera located close to the island's center.