| 1．Shizukuishi River |
| The Shizukuishi River (雫石川, Shizukuishigawa) is a river in Iwate Prefecture, in the Tōhoku region of northern Honshū in Japan.[1] The river is 33.2 kilometres (20.6 mi) long and has a watershed of 168 square kilometres (65 sq mi). In middle course of the river is the Shizukuishi Basin, occupied by the Yuguchi lake deposits from the Late Miocene.[2] |
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| 2．Nakatsu River |
| The Nakatsu River (中津川, Nakatsu-gawa) is a river in Iwate Prefecture, Japan. It flows through the city of Morioka, where it enters the Kitakami River.[1] |
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| 3．Kuji River (Iwate) |
| Kuji River (Japanese: 久慈川（くじがわ）, Hepburn: kujigawa) is a river in Kuji, Iwate of Japan. It rises at Mount Myojindake located in Kitakami Mountains, and flows into the Pacific Ocean at Kuji City. It is 27.609 kilometers (17.155 mi) in length, and is designated as a Class B river. The urban area of Kuji City is situated on the alluvial plain of the river.[1][2] |
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| 4．Sarugaishi River |
| The Sarugaishi River (猿ヶ石川, Sarugaishi-gawa) is a river in Iwate Prefecture, Japan.[1] The Sarugaishi River rises in the Kitakami Mountains just south of Mt. Yakushi in Tōno and empties into the Kitakami River in Hanamaki. The Tase Dam is on the Sarugaishi River, in eastern Hanamaki in the former town of Tōwa. This dam was completed in 1953. There is a legend that the entire floodplain of the river in Tōno was once a large lake dammed by the hills in Miyamori. |
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| 5．Mabechi River |
| The Mabechi River (馬淵川, Mabechigawa) is a river located in northern Iwate Prefecture and eastern Aomori Prefecture, in the Tōhoku region of northern Honshū in Japan. |
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| 6．Waga River |
| The Waga River (和賀川, Waga-gawa) is a river in Iwate Prefecture, Japan. From its headwaters near Mt. Waga in the Ōu Mountains it flows from north to south through the entire length of Nishiwaga Town before turning east through Kitakami City. The River enters the Kitakami River on the south side of the city opposite Mt. Otoko. |
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| 7．Isawa River |
| The Isawa River (胆沢川, Isawagawa) is a river in Iwate Prefecture, Japan. For about half its length it marks the border between Kanegasaki Town and Ōshū City. The river's origin is in the Ōu Mountains just west of Mt. Yakeishi (1548 meters). At its highest point it is called the Sugiyachi Stream (スギヤチ沢, Sugiyachizawa) and flows south until it crosses National Route 397. There it turns west and follows 397 until it is stopped by the Ishibuchi Dam.[1] |
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