 The Volga itself crosses the district from northwest to southeast, entering the Ivankovo Reservoir.The biggest tributaries of the Volga within the district are the Tvertsa River (left), which has its mouth in the city of Tver, the Shosha River (right), which crosses the southern part of the district, with the Lama River, a major tributary of the Shosha, forming a stretch of the border between Kalininsky and Konakovsky Districts, and the Soz River (left).The northeastern part of the district, northeast of Tver, is a swamp.