The general terrain of Greece is mountainous, comprising 80 percent of the country's mountains and hills, interspersed with numerous islands and islets around the Ionian and Aegean seas. Its main topographical features include a peninsular mainland, the Peloponnese peninsula and around 6,000 isles.
Greece, located in Southeast Europe, forms at the convergence of three continents: Asia, Europe and Africa. Situated on the southern tip of the Balkan Peninsula, Greece shares a border with Bulgaria, Macedonia, Albania and Turkey.
In ancient times, Greece was heavily forested, but it gradually turned bare and denuded when the use of iron implements became widespread at around 800 B.C.