noun
upper hot spring pool; upper bath
Refers to a higher-elevation bathing area in a hot spring facility; mainly used in proper names such as 上湯温泉.
上湯温泉は山の上の方にある。
Kamiyu Onsen is located higher up the mountain.
旅館には上湯と下湯の二つの浴場がある。
The inn has two baths: an upper bath and a lower bath.