Nemrut (volcano) the region. The collision of these plates began in the Middle Eocene and closed the stretch of water, which in the Mesozoic formed the Tethys Ocean. Nemrut, along with three other extinct volcanoes of eastern Turkey: Ararat, Tendürek and Süphan, is located in the area of a complex fault, which runs along the boundary of the Arabian and Eurasian plates in the territory of the Armenian Highland. It is the westernmost of these volcanoes, the only one that remains active, and generally the only volcano in Anatolia, which erupted in the historical period. Nemrut is located 10 km north of
Nemrut (volcano) northern edge of the caldera). The average height of the walls of the caldera, measuring from its bottom, is . The lowest point of the caldera coincides with the deepest point of Lake Nemrut ( above sea level). There are three lakes at the bottom of the caldera: the larger Lake Nemrut and two smaller ones, Ilı and the so-called "Seasonal Lake". Lake Nemrut () is located in the south-western part of the caldera and is now a freshwater lake. Similar to Lake Van, under the influence of volcanic processes it is gradually becoming a saline lake. The lake is