<P> It has a total area of 131,957 km (50,949 sq mi), of which land area is 130,647 km and internal waters (lakes and rivers) account for 1,310 km . Land boundaries with Albania (212 km), Republic of Macedonia (234 km), Bulgaria (472 km) and Turkey (192 km) measure approximately 1,110 km in total . Of the country's total territory, 83.33% or 110,496 km (42,663 sq mi) is mainland territory and the rest 16.67% or 21,461 km (8,286 sq mi) is island territory . </P> <P> Greece's coastline measures 13,676 km (8,498 mi). </P> <P> 80% of Greece is mountainous . The Pindus mountain range lies across the center of the country in a northwest - to - southeast direction, with a maximum elevation of 2,637 m . Extensions of the same mountain range stretch across the Peloponnese and underwater across the Aegean, forming many of the Aegean Islands including Crete, and joining with the Taurus Mountains of southern Turkey . Central and western Greece contain high and steep peaks intersected by many canyons and other karstic landscapes, including the Meteora and the Vikos Gorges--the latter being the world's deepest canyon in proportion to its width, and the third deepest after the Copper Canyon in Mexico and the Grand Canyon in the United States, plunging vertically for more than 1,100 metres . </P> <P> Mount Olympus is the highest point in Greece and the fourth highest in relative topographical prominence in Europe, rising to 2,919 m above sea level . The Rhodope Mountains form the border between Greece and Bulgaria; that area is covered with vast and thick forests . </P>

Which mountains extend through the center of greece