The Volga River flows through the lake in its upper course.

The lake has a surface area of 16.7 square kilometres (6.4 sq mi).

The northern end of the lake is located by the village of Zabelino.

The urban-type settlement of Peno is located at the southern end of the lake.

The drainage basin of the lake includes the whole northern part of Penovsky District and the northwestern part of Ostashkovsky District.