Ольдой

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Ольдой flows into 黑龙江 Амур , which it joins at N 53° 32′ 57″, E 123° 19′ 43″ at OSM node n305268680, and there 34,748 km of total upstream flows in. load it's distributaries

Ольдой has 3 tributaries.

• Малый Ольдой, which joins it at N 54° 4′ 17″, E 123° 25′ 32″ at OSM node n2398929578, and 557 km of total upstream flows in.
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• Большой Ольдой, which joins it at N 54° 4′ 17″, E 123° 25′ 32″ at OSM node n2398929578, and 422 km of total upstream flows in.
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• Большой Мадалан, which joins it at N 54° 2′ 56″, E 123° 25′ 34″ at OSM node n5251188561, and 67 km of total upstream flows in.
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