'Onsen' are natural hot springs, fueled by volcanic activity. Hugely popular in Japan, there are about 3,000 onsen establishments currently in Japan, ranging from smaller inns to larger resort accommodations.
Although you can find onsen indoors, oftentimes they are set up outside so patrons can relax and enjoy the natural scenery. The waters of onsen are silky and soft, and are said to have healing properties such as stress reduction, better sleep, and skin improvement.
Limited time only!
Onsen Saru (Onsen Zaru) in Japan