Greece has the longest coastline in Europe and is the southernmost country in Europe. The mainland has rugged mountains, forests, and lakes, but the country is well known for the thousands of islands dotting the blue Aegean Sea to the east, the Mediterranean Sea to the south, and the Ionian Sea to the west.
The country is divided into three geographical regions: the mainland, the islands, and Peloponnese, the peninsula south of the mainland.The Pindus mountain range on the mainland contains one of the world's deepest gorges, Vikos Gorge, which plunges 3,600 feet (1,100 meters). Mount Olympus is Greece's highest mountain at 9,570 feet (2,917 meters) above sea level. Ancient Greeks believed it was the home of the gods. Mount Olympus became the first national park in Greece.