小石川

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小石川 flows into 境川 , which it joins at N 35° 6′ 31″, E 137° 5′ 59″ at OSM node n727021673, and there 8 km of total upstream flows in. load it's distributaries

小石川 has 2 tributaries.

• 唐沢川, which joins it at N 35° 7′ 13″, E 137° 5′ 37″ at OSM node n727257572, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 35° 7′ 10″, E 137° 5′ 40″ at OSM node n727235341, and 141 m of total upstream flows in.
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