hot spring mineral harvesting area
A terraced or sloped area at a hot spring where mineral-rich water is flowed over surfaces to precipitate and collect mineral deposits, often seen at places like Kusatsu Onsen.
The yubatake at Kusatsu Onsen is a famous sightseeing spot.
The yunohana harvested at the yubatake is used as a bath additive.
Compound of 湯 (yu, 'hot water') and 畑 (hatake, 'field'), literally 'hot water field'.