is an onsen, or hot springs in Kita-ku, Kobe, Japan. This Onsen is still a hidden treasure of modern Kobe, behind Mount Rokkō. It attracts many Japanese who want tranquility with beautiful natural surroundings and yet easy access from the busy cities in the Kansai metropolitan area including Osaka. Arima Onsen was named in The Pillow Book, a famous Heian Era book, as one of the three famous springs in Japan. It was selected as the most prestigious hot spring during the Edo Era.