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| Oredezh | |
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 On the Oredezh near theSiverskaya station | |
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| Native name | Оредеж (Russian) |
| Location | |
| Country | Russia |
| Physical characteristics | |
| Mouth | Luga |
• coordinates | 58°48′42″N29°58′22″E / 58.8118°N 29.9729°E /58.8118; 29.9729 |
| Length | 192 km (119 mi)[1] |
| Basin size | 3,220 km2 (1,240 sq mi)[1] |
| Discharge | |
| • average | 20 m3/s (710 cu ft/s) |
| Basin features | |
| Progression | Luga→Gulf of Finland |
TheOredezh (Russian:О́редеж) is ariver inVolosovsky,Gatchinsky, andLuzhsky Districts in the south-western part ofLeningrad Oblast,Russia, a righttributary of theLuga. The length of the river is 192 kilometres (119 mi), whereas the area of itsdrainage basin is 3,220 square kilometres (1,240 sq mi). The principal tributary of the Oredezh is theSuyda (left).[1] A cascade of hydroelectric plants was constructed on the upper course of the river in 1948.
The source of the Oredezh is located inLake Kyurlevsky Karyer in the eastern part of Volosovsky District. The river flows south and crosses into Gatchinsky District. Upstream of the settlement ofBatovo it turns east and flows through the urban-type settlementsSiversky andVyritsa. At the eastern edge of Vyritsa it sharply turns to the south and accepts the Suyda from the left. It further crosses into Luzhsky District and by the selo ofMilodezh turns west. The mouth of the Oredezh is at the selo ofPloskoye.
The drainage basin of the Oredezh includes the southern part of Gatchinsky District and the eastern part of Luzhsky District, as well as minor areas in the east of Volosovsky District and in the southwest ofTosnensky District. Urban-type settlements of Siversky, Vyritsa, andDruzhnaya Gorka lie in the basin of the Oredezh. A part ofMshinskoye Boloto Zakaznik lies in the basin of the Oredezh, west of the river course.
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