The round flattened summits of the Valdai plateau do not rise above 1100 ft., and they present the appearance of mountains only in consequence of the depths of the valleys - the rivers which flow towards the depression of Lake Peipus being only 200 to 250 ft.
Above the sea, still filled by Lakes Peipus, Ladoga, Onega, Byelo-ozero, Lacha, Vozhe, and many thousands of smaller lakes, skirts the central plateau on the N., and follows the same E.N.E.
The Narova flows out of Lake Peipus into the Gulf of Finland at Narva; it has remarkable rapids, which are used to generate power for cotton-mills; in spite of this, the river is navigated.
Lake Peipus, or Chudskoye, receives the Velikaya, a channel of traffic with S.
M., but of this the part of Lake Peipus which belongs to it occupies 1090.
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