Isumi River
| Isumi River | |
|---|---|
| Native name | 夷隅川 (Japanese) |
| Location | |
| Country | Japan |
| Physical characteristics | |
| Source | |
| • location | Katsuura, Chiba Kamiueno District |
| Mouth | |
• location | Pacific Ocean |
• coordinates | 35°17′41″N 140°24′31″E / 35.29472°N 140.40861°E |
• elevation | 0 m (0 ft) |
| Length | 68 km (42 mi) |
| Basin size | 299 km2 (115 sq mi) |
The Isumi River (夷隅川, Isumigawa) is a river in Chiba Prefecture, Japan. It is 68 kilometers (42 mi) in length and has a drainage area of 299 square kilometers (115 sq mi). Under the Rivers Act of 1906 the Isumi is designated as a Class 2 River. Additionally, the government has designated the Isumi River a national-level Natural Monument (天然記念物, tennen kinenbutsu).