Isumi River
| 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.[1] Additionally, the government has designated the Isumi River a national-level Natural Monument (天然記念物, tennen kinenbutsu).[2] | ||||||
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| Length： 68 km (42 mi) | ||||||
| Basin size： 299 km2 (115 sq mi) | ||||||
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