半対沢

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半対沢 flows into 山室川 , which it joins at N 35° 51′ 39″, E 138° 6′ 54″ at OSM node n747926790, and there 34 km of total upstream flows in. load it's distributaries

半対沢 has 2 tributaries.

• (unnamed), which joins it at N 35° 51′ 31″, E 138° 7′ 16″ at OSM node n748482186, and 512 m of total upstream flows in.
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• (unnamed), which joins it at N 35° 51′ 23″, E 138° 7′ 42″ at OSM node n748402052, and 358 m of total upstream flows in.
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