The Volga is a lake in Selizharovsky, Ostashkovsky and Penovskiy districts of the Tver region of Russia, 25 km to the south of Ostashkov, the largest in the system of the Upper Volga lakes in the Valdai Upland, the fourth and last of the group of lakes through which the upper reaches of the Volga River passes is regulated by the Verkhnevolzhsky Beyshlot.
Two lakes of the Volga (Volgo-I, Volgo-II), connected by a channel at the Bolshoy and Maly Lokhovo, are stretched from the west to the east by 40 km, the width of the lakes is up to 4 km, the average depth is 2 m, the surface area of the lake is 61 km2. Lake Volgo as a result of the construction of the Verkhnevolzhsky Beychlos significantly changed its borders. Before its length was 7 km, width - up to 2 km. Now Volgo stretches from the village of Volga (Tukhachevo), in the west to the village of Selishche in the east. Between the lakes Peno and Volgo (about 30 km) the Volga River is a spill, then expanding, then cutting its borders. The southern shores of the Volga are more elevated, the northern ones are more low-lying. In some places along the high banks limestone outcrops are visible. From limestones are often beaten keys - the so-called "boiling water" with water, "healthy", the temperature of which is equal to 6 ° C throughout the year. In the area of the villages Kolobovo, Polka and Pochinok, the lake forms three large bows.
In the western part of Peno in the Volga-I from the south fall the river Plotichyanka and Zhukop. On the northern shore of Volga-I (length 19 km) villages Kustyn and Zaneprechye. In the channel between the lakes from the south flow the rivers of Lemenka and Bolshaya Dubenka, from the north - the river Kocha.
On the northern shore of the Volga-II (length 21 km, width up to 3 km) two large gulfs. Almost in the center of the lake is the White Plov island. The northern shores of the lake are low, often flooded by spills. On the banks of the Volga-II are the villages of Yasenskoye, Pochinok, Zavirje, Polka, Lapino, Volga (Tukhachevo), Deviche, Kolobovo, Bor, Kazakovo. In the place where the Volga River flows from Volgo-II, the village of Selishche is located.
The water level in the lake may vary considerably depending on the mode of the backslot.