Greece shares land borders with Albania.
Epirus ( [ ɪˈpaɪrəs ] Ήπειρος , Ípeiros ) , formally the Epirus Region ( Περιφέρεια Ηπείρου , Periféreia Ipeírou ) , is a traditional geographic and modern administrative region in northwestern Greece . It borders the regions of West Macedonia and Thessaly to the east , West Greece to the south , the Ionian Sea and Ionian Islands to the west and Albania to the north . Geography of Greece . Its mainland is located at the southernmost tip of the Balkan Peninsula and is surrounded on the north by Albania , the Republic of Macedonia and Bulgaria ; to the east by the Aegean Sea and Turkey , to the south by the Mediterranean Sea and to the west by the Ionian Sea and Italy . Greece . 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 . Philip of Macedon united most of the Greek mainland in the fourth century BC , with his son Alexander the Great rapidly conquering much of the ancient world , spreading Greek culture and science from the eastern Mediterranean to the Indus River .