Central Siberian speleological country

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The Middle Siberian speleological country includes the Middle Siberian Plateau, the North Siberian Lowland, and the Byranga Mountains. Karst caves are most widely developed in the southern part of the territory, which is distinguished as the Angaro-Lenskaya speleological province, part of the Lena-Yenisei region. More than 80 caves have been identified here.

The largest and most famous among them are Khudugunskaya (3000 m long), Balaganskaya (1200 m), Bolshaya Nizhneudinskaya (550 m) and Malaya Nizhneudinskaya (160 m).

Khudugunskaya cave is located on the left bank of the Angara River, near the town of Cheremkhovo. It was formed in limestones of the Lower Cambrian. The cave has several small grottoes, from which straight and long corridors go off in different directions.

All the passages and grottoes of the cave are confined to tectonic fractures of northwestern and northeastern extent. The total length of the cave is 3000 meters. The Korshunikha natural mine located in the valley of the Korshunikha River (Ilim River basin) is interesting. Its depth is 133 m.