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Shiba River

The Shiba River (芝川, Shiba-kawa) is a tributary of the Arakawa River that mainly runs through the eastern part of Saitama Prefecture. The river has Suehiro (末広) and Kobari-ryōke (小針領家) in Okegawa, Saitama as points of origin and flows through Ageo, Minuma and Kawaguchi, and connects to the Arakawa River.

History

Originally, the river flowed into a wetland at the current region of Minuma. In 1629, a civil engineering project by Ina Tadaharu (伊奈 忠治) created a reservoir and blocked the flow. In 1727, the reservoir levee was demolished to open up the area for creating rice paddies. In 1728, the lowest sections of the area were gouged to allow for the passage of water, which set the current position of the river.

Water quality

The water quality of the river is poor, since it flows through urban areas. A report published in 2006 by the Ministry of the Environment indicates levels of dioxins and dioxin-like compounds above the standards set for public waterways. For this reason, recent years saw efforts to clear up the river.

References

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Rivers of Hokkaido Sea of Japan Ishikari River Chitose River Toyohira River Makomanai River Anano River Yūbari River Koetoi River Rumoi River Shiribeshi-Toshibetsu River Shiribetsu River Teshio River Zenibako River Sea of Okhotsk Abashiri River Shibetsu River Shokotsu River Tokoro River Yūbetsu River Pacific Ocean Akan River Kushiro River Mitsuishi River Mu River Niikappu River Saru River Shizunai River Tokachi River Rivers of Hokkaido on Commons
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