The Yunokawa Onsen (湯の川温泉) is a well known onsen in Japan on the northern island of Hokkaidō. It is located on the outskirts of Hakodate city close to Hakodate Airport.
This onsen is considered by Japanese to be one of the three major hot springs in Hokkaidō. Its origins are said to date back to 1653 when a lord of the Matsumae clan was healed of an incurable illness by bathing in its waters.
It contains various minerals including chloride and sulphur.