Transformation of the Valley of Geysers (Kamchatka)—One of the Largest Geysers Fields in the World

The paper describes geological, geomorphological and hydrogeological features of the Valley of Geysers in Kamchatka. Particular attention is paid to destructive processes that change the landscape of this pristine corner of Russia. In hydrothermal zones highly mineralized thermal waters destroy the bedrock to clay, which is the reason for the widespread development of landsliding processes on slopes. The Valley of Geysers has not become an exception. Over the past 40 years there have happened several catastrophic landslides that caused debris flows, which damaged some unique geysers and boiling springs: some of them were flooded, and some were buried with mud deposits.