A secret hot spring inn located in front of Awamata Waterfall, a famous waterfall in Minamiboso, located in the Yoro Valley in the central and southern part of Chiba Prefecture. Otaki Town, including the Yoro Valley, has long been a key trading hub where mountain and seafood intersect. You can enjoy carefully selected mountain seafood from Minamiboso while staying in a mountainous inn. The hot spring was named "Fossil Hot Spring" because the fossil of sea urchin about 120 thousand years ago was excavated during mining, and the ingredient is effective for skin diseases, burns, wounds, etc. It has been. Please relax while being surrounded by the magnificent nature of Oku Boso.