古川川
古川川 is 1 km long, and has a stream level of 0.
Map of 古川川
This area:
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osm.org Distributaries / Outflows
古川川 flows into the sea:
1 km flows in at N 30° 27′ 49″, E 130° 51′ 54″ at OSM node n742816885.
Tributaries
古川川 has 0 tributaries.