(unnamed)

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(unnamed) flows into 神流川 , which it joins at N 36° 11′ 14″, E 139° 3′ 52″ at OSM node n759598302, and there 325 km of total upstream flows in. load it's distributaries

(unnamed) has 2 tributaries.

• 本郷沢, which joins it at N 36° 11′ 11″, E 139° 4′ 8″ at OSM node n1048103372, and 521 m of total upstream flows in.
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• 山王沢, which joins it at N 36° 11′ 11″, E 139° 3′ 59″ at OSM node n1048295496, and 297 m of total upstream flows in.
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