(unnamed)

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(unnamed) flows into 伊南川 , which it joins at N 37° 15′ 38″, E 139° 32′ 4″ at OSM node n757024955, and there 425 km of total upstream flows in. load it's distributaries

(unnamed) has 3 tributaries.

• 瀬戸沢, which joins it at N 37° 15′ 10″, E 139° 32′ 6″ at OSM node n756567347, and 4 km of total upstream flows in.
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• 大沢, which joins it at N 37° 15′ 10″, E 139° 32′ 6″ at OSM node n756567347, and 2 km of total upstream flows in.
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• 久保沢, which joins it at N 37° 15′ 30″, E 139° 32′ 5″ at OSM node n756487008, and 788 m of total upstream flows in.
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