Uzon Caldera is the thing that was left from a huge volcano destroyed by the series of volcanic explosions that took place approximately 40,000 years ago. The height of the former volcano was about 3000 meters (10,000 feet), that's what vulcanologist say. At present, the caldera looks like a flat-bottomed punchbowl, 10 kilometers (6,5 miles) in diameter. These steep edges 200-900 meters high (650-3000 feet) are half-destroyed walls of the ancient volcano. Uzon is a 9 by 12 km volcanic caldera located in the eastern part of Kamchatka Peninsula, Russia.