Lake Cheko , the lake formed by Tunguska event in 1908.

Lake Cheko (Russian: Чеко) is a small freshwater lake in Siberia, near the Podkamennaya Tunguska River, in what is now the Evenkiysky District of the Krasnoyarsk Krai. It is a small bowl shaped lake, 708 m long, 364 m wide and about 50 m deep. Scientists have speculated that Lake Cheko was created during the Tunguska event, an explosion on 30 June 1908 that destroyed more than 2,000 km2 (800 sq mi) of Siberian taiga. It is suggested that the lake, which lies approximately 8 kilometres north-north-west of the event hypocenter, was formed by a fragment impacting the ground. [1] A 1961 investigation estimated the age of the lake to be at least 5000 years, based on meters-thick silt deposits on the lake bed newer research suggests that only a meter or so of the sediment layer on the lake bed is "normal lacustrine sedimentation", indicating a much younger lake of about 100 years./Wikipedia/