(unnamed)

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(unnamed) flows into 小本川 , which it joins at the following points: 344 km of total upstream flows in at N 39° 50′ 22″, E 141° 44′ 58″ at OSM node n753372857 342 km of total upstream flows in at N 39° 49′ 50″, E 141° 44′ 41″ at OSM node n753536170 load it's distributaries

(unnamed) has 1 tributaries.

• 沢山沢, which joins it at N 39° 49′ 52″, E 141° 44′ 44″ at OSM node n754385331, and 2 km of total upstream flows in.
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