古子川

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古子川 flows into 高瀬川 , which it joins at N 34° 11′ 52″, E 133° 42′ 24″ at OSM node n756225843, and there 43 km of total upstream flows in. load it's distributaries

古子川 has 2 tributaries.

• 下池川, which joins it at N 34° 10′ 58″, E 133° 42′ 35″ at OSM node n756104825, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 34° 11′ 17″, E 133° 42′ 29″ at OSM node n756183838, and 632 m of total upstream flows in.
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