http://www.minamioguni.com/kanko/210

A hot spring town spreads along the Manganji River. There are three lodging facilities. There are 3 public baths. Manganji Onsenkan, an open-air bath (kawayu) along the river, and a hot spring located 100m upstream of this river. Kamiyu became a men-only bath when the Manganji Onsenkan was rebuilt.

Aso City is renowned for its top-quality hot springs with abundant water. Among the hot springs, Uchinomaki Onsen is the representative of the hot springs in Aso, where over 30 hotels and Japanese-style hotels are located. 

Quote : https://kumanago.jp