Awesome Search Japan

river in Isum

1．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]
Wikipedia  detail