Greece (Greek: Ελλάδα, Elláda[eˈlaða]), officially the Hellenic Republic (Greek: Ελληνική ΔημοκρατίαEllīnikī́ Dīmokratía[eliniˈci ðimokraˈti.a]), also known since ancient times as Hellas (Ancient Greek: ἙλλάςHellás[ˈhɛləs]), is a country located in southeastern Europe. According to the 2015 census, Greece's population is approximately 10.9 million. Athens is the nation's capital and largest city, followed by Thessaloniki.
Greece is strategically located at the crossroads of Europe, Asia, and Africa. Situated on the southern tip of the Balkan peninsula, it shares land borders with Albania to the northwest, the Republic of Macedonia and Bulgaria to the north and Turkey to the northeast. Greece consists of nine geographic regions: Macedonia, Central Greece, the Peloponnese, Thessaly, Epirus, the Aegean Islands (including the Dodecanese and Cyclades), Thrace, Crete, and the Ionian Islands. The Aegean Sea lies to the east of the mainland, the Ionian Sea to the west, and the Mediterranean Sea to the south. Greece has the longest coastline on the Mediterranean Basin and the 11th longest coastline in the world at 13,676 km (8,498 mi) in length, featuring a vast number of islands, of which 227 are inhabited. Eighty percent of Greece is mountainous, with Mount Olympus being the highest peak at 2,918 metres (9,573 ft).
The history of Greece is one of the longest of any country, having been continuously inhabited since 270,000 BC. Considered the cradle of Western civilization, Greece was the birthplace of democracy, Western philosophy, the Olympic Games, Western literature, historiography, political science, major scientific and mathematical principles, and Western drama, including both tragedy and comedy. The Greeks were first unified under Philip of Macedon in the fourth century BC. His son Alexander the Great rapidly conquered much of the ancient world, spreading Greek culture and science from the eastern Mediterranean to the Indus River. Greece was annexed by Rome in the second century BC, becoming an integral part of the Roman Empire and its successor, the Byzantine Empire. The first century AD saw the establishment of the Greek Orthodox Church, which shaped modern Greek identity and transmitted Greek traditions to the wider Orthodox World. Falling under Ottoman dominion in the mid-15th century, the modern nation state of Greece emerged in 1830 following a war of independence. Greece's rich historical legacy is reflected in large part by its 18 UNESCO World Heritage Sites, among the most in Europe and the world.
Greece is a democratic and developed country with an advanced high-income economy, a high quality of life and a very high standard of living. A founding member of the United Nations, Greece was the tenth member to join the European Communities (precursor to the European Union) and has been part of the Eurozone since 2001. It is also a member of numerous other international institutions, including the Council of Europe, North Atlantic Treaty Organization (NATO), Organisation for Economic Co-operation and Development (OECD), WTO, OSCE, and the OIF. Greece's unique cultural heritage, subsequently large tourism industry, and prominent shipping sector classify it as a middle power. It is the largest economy in the Balkans, where it is an important regional investor.