 The principal tributary of the Mologa within the district, the Osen (right), is rather short, but its drainage basin covers the whole eastern part of the district.The Tifina, a tributary of the Volchina, a major left tributary of the Mologa, has its source in the southwestern corner of the district.Minor areas in the southeast of the district belong to the basin of the Kashinka River, a tributary of the Volga.