上大三郎川

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上大三郎川 flows into 小瀬川 , which it joins at N 34° 16′ 23″, E 132° 8′ 1″ at OSM node n751558208, and there 163 km of total upstream flows in. load it's distributaries

上大三郎川 has 4 tributaries.

• (unnamed), which joins it at N 34° 16′ 34″, E 132° 7′ 18″ at OSM node n749040286, and 818 m of total upstream flows in.
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• (unnamed), which joins it at N 34° 16′ 32″, E 132° 7′ 42″ at OSM node n749188542, and 610 m of total upstream flows in.
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• (unnamed), which joins it at N 34° 16′ 24″, E 132° 7′ 5″ at OSM node n749738515, and 424 m of total upstream flows in.
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• (unnamed), which joins it at N 34° 16′ 38″, E 132° 7′ 25″ at OSM node n749887483, and 100 m of total upstream flows in.
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