Yubara Dam
The 309th tallest dam in the world
Yubara Dam is a dam in Okayama Prefecture, Japan, completed in 1954. At the base of the dam wall is a small village with a number of onsen hotels. There is also an outdoor, mixed bathing bath, or rotenburo, by the river. This facility is free.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).