Iya [Hot Springs] - Iya

...A river in the western part of Tokushima Prefecture. A tributary of the Yoshino River, its source is west of Mount Tsurugi, and it forms a vertical valley up to Nishi-Iyayama Village, Zentoku, and for about 20 km from Zentoku it forms a V-shaped gorge (Iya Valley), which merges with the Matsuo River at Dejo, and then becomes the main stream of the Yoshino River at Otari. It has a total length of 54 km, and a drainage area of ​​about 280 km2.

*Some of the terminology that refers to "Iya Hot Springs" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…徳島県西部の川。吉野川の支流で水源は剣山西にあり，西祖谷山村善徳まで縦谷をなし，善徳から約20kmはV字形の峡谷(祖谷渓)をなして，出合で松尾川に合流し，さらに大利で吉野川本流となる。全長54km，流域面積約280km2。…

※「祖谷[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