洞爺川

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洞爺川 flows into the sea: 4 km flows in at N 42° 38′ 50″, E 140° 50′ 9″ at OSM node n518297963.

洞爺川 has 2 tributaries.

• 大西川, which joins it at N 42° 38′ 59″, E 140° 50′ 5″ at OSM node n1466408433, and 1 km of total upstream flows in.
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• 三浦沢川, which joins it at N 42° 39′ 14″, E 140° 49′ 54″ at OSM node n1466412577, and 1 km of total upstream flows in.
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