Удерь

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Удерь flows into Сардан , which it joins at N 57° 43′ 29″, E 49° 42′ 51″ at OSM node n1368184939, and there 158 km of total upstream flows in. load it's distributaries

Удерь has 3 tributaries.

• (unnamed), which joins it at N 57° 43′ 40″, E 49° 44′ 28″ at OSM node n1959090814, and 19 km of total upstream flows in.
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• (unnamed), which joins it at N 57° 43′ 25″, E 49° 49′ 0″ at OSM node n1959089611, and 933 m of total upstream flows in.
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• (unnamed), which joins it at N 57° 43′ 35″, E 49° 43′ 14″ at OSM node n1959090265, and 363 m of total upstream flows in.
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