From Wikipedia: "Mt. Nemrut is near Tatvan, a small town in the eastern Anatolian province of Bitlis. The mountain rises from the southwestern shore of Lake Van, and enters the district of Ahlat to the north.
It is 3,050 m (10,007 ft) high and its elliptic caldera has a diameter of about 7 by 8 km (4 by 5 mi). The western part of the caldera contains a large coldwater crater lake about 155 m (509 ft) deep. There is also a small warm lake whose temperature reaches 60 °C (140 °F), providing evidence of continuing volcanic activity."