hidden Drainage network HYDROGRAPHIC NETWORK. Over 19500 rivers and 1800 lakes (Ladoga and Onega being the largest ones) form the H. N. of the Leningrad Oblast. The river network is dense and ramified. One exception is the Izhora Hills where the river network density is... more

hidden Oyat River, the OYAT, river, left-hand tributary of the Svir River. Length: 266 km. The average flow rate in the mouth is 54.8 cu. m/s, catchment area: 5220 sq. km. Its source is Lake Chaimozero on the Veps Hills (in Vologda Oblast, 7 km away from the Leningrad... more