The European section of Turkey, also known as East Thrace () is located at the easternmost edge the Balkan peninsula. It forms the border between Turkey and its neighbours Greece and Bulgaria. The Asian part of the country mostly consists of the peninsula of Anatolia, which consists of a high central plateau with narrow coastal plains, between the Köroğlu and Pontic mountain ranges to the north and the Taurus Mountains to the south. Eastern Turkey has a more mountainous landscape and is home to the sources of rivers such as the Euphrates, Tigris and Aras. The western portion of the Armenian highland is located in eastern Turkey; this region contains Mount Ararat, Turkey's highest point at , and Lake Van, the largest lake in the country. Southeastern Turkey is located within the northern plains of Upper Mesopotamia.