Caves of Pinega: visibly alive

The caves of Pinega are a few systems of including about 100 sinks, situated in the karst area in the Pinezhsky District of Arkhangelsk Region, in the interstream area of the Pinega and Kuloy Rivers. The caves are situated on the territory of the Pinega natural reserve. They have some special features, instead of the caves of Caucasus and others, but the most interesting one is that the changes in the configuration and plan of the caves, be observed during the human life: the Pinega caves live very active life.