Itakura Swamp

…It borders Saitama Prefecture and Tochigi Prefecture. The Watarase River flows along its northern edge, and the Tone River along its southern edge. In the past, it was a low-lying marshland dotted with ponds and marshes of various sizes, including Itakura Marsh, and was a frequent flood-prone area. During the middle to late Meiji period, it suffered serious damage from mineral poisoning at the Ashio Mine. …

*Some of the terminology that refers to "Itakura Numa" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…埼玉県，栃木県と接する。北縁を渡良瀬川，南縁を利根川が流れ，かつては板倉沼など大小の池沼が散在した低湿地帯で，水害常襲地であった。明治時代中～後期には足尾鉱山の鉱毒で大きな被害を受けた。…

※「板倉沼」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報