- Omoigawa River Right Bank 1.9KP | Tomonuma, Nogi Town, Tochigi Prefecture 329-0101 | Ministry of Land, Infrastructure, Transport and Tourism
- Matsubara Ohashi upstream water level monitoring, Omoigawa River | Tomonuma, Nogi Town, Tochigi Prefecture 329-0101 | Tone River Upstream River Office
- Matsubara Ohashi Left bank upstream, Omoigawa River Left Bank 1.0K | Tomonuma, Nogi Town, Tochigi Prefecture 329-0101 | Tone Upstream River Office
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