Arima Onsen is a famous for being the oldest hot spring in Japan. Arima hot-spring water contains 7 of the 9 major minerals with acknowledged medical and therapeutic benefits. Water of such quality is very rare in the world. One of the minerals is particularly effective in making the skin smoother and healthier. The hot-spring attracts vistors from all over the world/ and is beloved by noteworthy figures such as the Imperial family.