Deyu Onsen
- Location
- Agano, Niigata, Japan
- Water type
- sulfurous
- Temperature
- 44 °C
- pH
- 6.5
Water profile
Relaxing — deep, immediate muscle release.
Rich in active gases or metals — a strong mineral character.
Soft water — natural, classic buoyancy.
Deyu Onsen is a historic hot spring in Agano City, Niigata Prefecture, in the Echigo region of central Honshu, forming part of the celebrated Gozu Onsenkyo hot spring cluster together with the neighboring Imaita and Murasugi springs, situated within the Gozu Mountain Prefectural Natural Park designated among Japan's Top 100 Forest Bathing Sites. The area near the serene Hyoko Lake, a famous wintering ground for whooper swans that draws bird-watching visitors from across Japan each autumn, and the forested Gozu Mountain range provide an exceptional natural setting for this quiet mountain spa whose ancient bathing tradition has served the local community since before recorded history. The surrounding environment of beech forests, rivers, camping grounds, and the mirror-like Hyoko Lake makes Deyu Onsen a destination valued equally for its thermal waters and its immersion in one of the most beautiful natural landscapes of the Niigata mountain interior.