Kamyshlov Log

The Kamyshlov Log (Russian: Камышловский лог or Урочище Камышловский лог; Kazakh: Камыстысай), is the valley of a disappeared river in Siberia. Administratively it falls within Omsk Oblast, Siberian Federal District, of the Russian Federation, as well as the North Kazakhstan Region of Kazakhstan.

The first geographical observations about the Kamyshlov Log in the early 18th century described it as a flowing river, consisting in a chain of long lakes interconnected by channels, which seasonally dried up, but flowed again during periods of high water. However, by the 19th century most of the surrounding steppe was converted into agricultural fields and the flow between the lakes gradually stopped. The runoff along an almost imperceptible channel last took place in 1865 when the water reached the village of Poludino.