Ohrid Lake is of tectonic origin and it is one of the oldest lakes in the world. It is 288 metres deep and it is the deepest lake in the Balkan region. Its average depth is 155 m. Ohrid Lake is known for crystal clear water. The lake occupies the area of 358 km2, it is 30.4 km long and 14.8 km wide. The water volume is 55.4 km3. Despite the altitude, the water in Ohrid Lake never gets frozen due to the extraordinarily mild climate in this region. The lake is known for numerous endemic relict animal species from the Tertiary period. In the surrounding area, there are ancient monuments that remind the rich history of the settlements around the lake. There are sand beaches, too. In 1979, Ohrid Lake was declared the UNESCO Heritage Site.