In the upper reaches of the Volga - fast and rocky river. From the upper Volga lakes to the Rzhev there are more than thirty rapids. The most famous Bensky threshold, near the village of Yelets, where over one kilometer drop of water reaches three feet! Thresholds appeared at the site exit to the surface layers of the lower carboniferous limestone, which have increased strength due to marmorization. Numerous eddies and surf create the sound of water, which can be heard at a great distance. Bensky threshold - one of the most beautiful and famous natural monuments in Selizharovsky district of Tver region. These thresholds - the main obstacle to the water tourists.