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The area of the reserve is elongated from southeast to northwest and is adjacent to the border between Novgorod and Pskov Oblasts. At the other side of the border, in Pskov Oblast, the nature reserve continues as Polistovsky Nature Reserve. Rdeysky Nature Reserve belongs to the river basins of the Lovat River and the Polist River, though none of them flows through the reserve. Lake Rdeyskoye, a major lake at the northwest of the reserve of which a part of the shore belongs to the reserve, is the source of the Redya River, a major left tributary of the Lovat River.