noun
artificial hot spring; man-made hot spring
Refers to a hot spring facility where the water is artificially heated or treated, as opposed to a natural onsen. Common in travel and leisure contexts.
このホテルには人工温泉の大浴場があります。
This hotel has a large public bath with an artificial hot spring.
天然温泉と人工温泉の違いは何ですか。
What is the difference between a natural hot spring and an artificial one?
Compound of 人工 (じんこう, 'artificial') and 温泉 (おんせん, 'hot spring').