古川

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古川 flows into 豊川放水路 , which it joins at N 34° 48′ 15″, E 137° 24′ 9″ at OSM node n727023687, and there 5 km of total upstream flows in. load it's distributaries

古川 has 1 tributaries.

• (unnamed) , which joins it at the following points: 1 km of total upstream flows in at N 34° 49′ 8″, E 137° 25′ 8″ at OSM node n727194372 1 km of total upstream flows in at N 34° 49′ 8″, E 137° 25′ 8″ at OSM node n727194372
load it's tributaries