古谷川

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古谷川 flows into 小坂部川 , which it joins at N 35° 6′ 44″, E 133° 33′ 44″ at OSM node n751049562, and there 43 km of total upstream flows in. load it's distributaries

古谷川 has 1 tributaries.

• (unnamed), which joins it at N 35° 7′ 55″, E 133° 34′ 10″ at OSM node n751454710, and 1 km of total upstream flows in.
load it's tributaries