 The district lies in the southeastern part of the Valdai Hills and is split between the drainage basins of the Baltic and Caspian Seas.The rivers in the western part of the district drain into the Msta, a major tributary of Lake Ilmen, which belongs to the basin of the Neva and thus of the Baltic Sea.The Msta itself crosses the southwestern part of the district and makes a stretch of the border between Udomelsky and Bologovsky Districts.