Arayu [Hot Spring] - Arayu

...A hot spring located in the northwest of Gunma Prefecture, in the northern part of Nakanojo Town, Agatsuma County. It is a collective name for the four hot springs of Onsenguchi, Yamaguchi, Arayu, and Hinatami, which face the valley of the upper reaches of the Shima River, and is also called Shima Onsenkyo. The hot springs have a long history, and it is said that they were discovered by Usui Sadamitsu, one of the four heavenly kings of Minamoto no Yorimitsu, or that Sakanoue no Tamuramaro established a hot spring inn there when he conquered Oshu. Along with Ikaho and Kusatsu, they were known as famous hot springs in northern Kanto. ...

*Some of the terminology that refers to "Shinyu [hot spring]" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…群馬県北西部，吾妻（あがつま）郡中之条町の北部にある温泉。四万川上流部の渓谷に臨む，温泉口，山口，新湯（あらゆ），日向見（ひなたみ）の4温泉の総称で，四万温泉郷とも呼ばれる。開湯の歴史は古く，源頼光の四天王の一人碓井貞光の発見とか，坂上田村麻呂が奥羽征討のおり湯宿を設けたとかいわれ，伊香保，草津とともに北関東の名湯として知られた。…

※「新湯[温泉]」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