therapeutic hot spring
A hot spring used for medical treatment or recuperation, often with specific mineral properties.
This area has many therapeutic hot springs and is popular with people seeking hot-spring cures.
温泉 is a general hot spring, while 療養温泉 specifically refers to one used for medical treatment or recuperation.
湯治 is the practice of bathing in hot springs for therapeutic purposes, often at a 療養温泉.
Compound of 療養 (medical treatment, recuperation) and 温泉 (hot spring).