<P> Greece is 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 . The Aegean Sea lies to the east of the mainland , the Ionian Sea to the west , the Cretan Sea 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 large 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 country 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 . </P>
what three modern countries are on the northern border of greece
Albania Republic of Macedonia Bulgaria Turkey