The Pigeon Grotto, located on the Kyzladyr Karst Field, is certainly one of the most famous sinkholes in the region. Like many other sinkholes in the karst field, the Pigeon Grotto is formed under the influence of rainwater, frost and various geological processes. Inside the Pigeon Grotto sinkhole there is a small lake, probably fed by groundwater
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Blue Lake in the Republic of Tatarstan, in the urban district of Kazan, is a unique natural system consisting of three unconnected reservoirs: Bolshoye Goluboe, Protochnoe and Maloe Goluboe. These lakes are of karst origin and are oxbow lakes of the Kazanka River. The lakes attract attention with their unusual natural beauty and peculiarities of w
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