“Takaragawa Onsen” is located in Gunma Prefecture and is an underground boom in popularity by foreign tourists. The characteristics are an open air bath that stretches along side a river and is mixed bathing.
Since the entire river is a hot spring, the amount of hot water is exceeding. People say the mixed bath in nature allows you to only hide private parts and soak in the hot water, so they can feel unrealistic. Bathing in the night is also available.
In addition to the hot spring, there are antiques and a live bear kept in the place, that can get you a strange feeling for the place.