Greece, also known as Hellas and officially the Hellenic Republic, is a country in southeastern Europe, situated on the southern end of the Balkan Peninsula. Greece has the tenth longest coastline in the world at 14,880 km (9,246 mi) in length, featuring a vast number of islands (approximately 1400, of which 227 are inhabited), including Crete, the Dodecanese, the Cyclades, and the Ionian Islands among others. Eighty percent of Greece consists of mountains, of which Mount Olympus is the highest at 2,917 m (9,570 ft). <br/> Modern Greece traces its roots to the civilization of ancient Greece, generally considered to be the cradle of Western civilization. As such, it is the birthplace of democracy, Western philosophy, the Olympic Games, Western literature and historiography, political science, major scientific and mathematical principles, and Western drama, including both tragedy and comedy. This legacy is partly reflected in the 17 UNESCO World Heritage Sites that are located in Greece. <br/> Athens is the capital. Other major cities include Thessaloniki, Piraeus, Patras, Heraklion and Larissa.