優園川

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優園川 flows into 長流川 , which it joins at N 42° 35′ 31″, E 141° 1′ 33″ at OSM node n1466347651, and there 181 km of total upstream flows in. load it's distributaries

優園川 has 2 tributaries.

• 門前川, which joins it at N 42° 35′ 33″, E 141° 2′ 19″ at OSM node n1466348335, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 42° 35′ 27″, E 141° 2′ 27″ at OSM node n1466346138, and 567 m of total upstream flows in.
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