Seki River
| 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) |
The Seki River (関川) is a Class A river in Niigata Prefecture and Nagano Prefecture, Japan. Approximately 210,000 people live in the basin area.