| Seki River 関川 | |
|---|---|
|  Seki River in Niigata, Japan | |
| Location | |
| Country | Japan | 
| State | Honshu | 
| Region | Niigata Prefecture, Nagano Prefecture | 
| Physical characteristics | |
| Source | Niigata-Yakeyama | 
| • elevation | 2,400 m (7,900 ft) | 
| Mouth | Sea of Japan | 
|  • coordinates | 37°10′57″N 138°14′47″E / 37.18239°N 138.2465°E | 
| Length | 64 km (40 mi) | 
| Basin size | 1,140 km2 (440 sq mi) | 

Kenshinko Bridge in Jōetsu City
The Seki River (関川) is a river in Niigata Prefecture and Nagano Prefecture, Japan.[1]
References
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