高草川

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高草川 flows into 東益津トンネル , which it joins at N 34° 53′ 32″, E 138° 20′ 5″ at OSM node n735912154, and there 7 km of total upstream flows in. load it's distributaries

高草川 has 2 tributaries.

• 石脇トンネル, which joins it at N 34° 53′ 35″, E 138° 19′ 39″ at OSM node n1753668996, and 6 km of total upstream flows in.
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• (unnamed), which joins it at N 34° 53′ 33″, E 138° 20′ 4″ at OSM node n735537600, and 607 m of total upstream flows in.
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