hot-spring bathing; bathing in a hot spring
Refers to the act of bathing in a natural hot spring, often for relaxation or health benefits.
Hot-spring bathing is good for a tired body.
At this inn, you can enjoy hot-spring bathing in an open-air bath.
入浴 is general bathing (in a tub, etc.); 温泉浴 is specifically bathing in a hot spring.
Compound of 温泉 (hot spring) and 浴 (bathing).