Soj
The district is located on the Smolensk Upland. The whole area of the district belongs to the drainage basin of the Dnieper. The Desna River, a major left tributary of the Dnieper, crosses the northern part of the district. A stretch of the Desna makes the border between Smolensk and Kaluga Oblasts. In Desnogorsk, a dam is built on the Desna, and Desnogorsk Reservoir is shared between the city of Desnogorsk, Roslavlsky, Pochinkovsky, and Yelninsky Districts. The rivers in the southwestern part of the district drain into the Ostyor River and the Iput River, tributaries of the Sozh River. The Ostyor itself has its source in the district.