Nemrut (volcano) inside the caldera, becoming the world's second largest caldera lake. Subsequent eruptions separated a small lake Ilı from Lake Nemrut. Nemrut volcano has an elliptical shape, its size at the base is 27×18 km, and its center contains 377.5 km of volcanic materials. The caldera of Nemrut is the largest in Turkey, the fourth largest in Europe and sixteenth largest in the world. Locals link the name of the volcano with the legendary ruler Nimrod, who is credited with the construction of the Tower of Babel. Turkish chronicles of the 16th century reproduce a local legend as follows: Eruptions of
Nemrut (volcano) fissure eruptions that later localized in separate vents separated by 5–10 km. These eruptions resulted in a strong (thicker than 50 m) layer of successive pyroclastic deposits consisting mainly of trachyte. Their products covered an area of 500 km, forming a plateau that hid the continental deposits of the Miocene period. The cone of Nemrut was further formed by mobile dark trachytic lavas, which gradually filled Bitlis gorge to a distance of 80 km from the volcanic center. Lava flows reached a width of 200 m and had a thickness of 5–30 meters. Consequent deposits from basalt and trachytic lavas