Takanoyu Onsen Yamagata Shinkansen (Shinjo Station). Takanoyu Onsen Takanoyu Onsen (♨鷹の湯温泉) is one of several hot spring resorts in the Akinomiya Hot Spring Resort area of Yuzawa, a town in southern Akita Prefecture. The onsen is nestled in a small gorge along the banks of the Yakunai River. Because of its secluded location, it is referred to as a Hitou, or hidden hot spring. Legend has it that the Akinomiya Hot Springs, the oldest in Akita Prefecture, were found 1,200 years ago. Local legend also has it that Takanoyu, or Falcon's Hot Spring, got its name when a falcon led a hunter
Onsen found in some onsens with poor sanitation. Revelations of poor sanitary practices at some onsens have led to improved regulation by hot-spring communities to maintain their reputation. There have been reports of infectious disease found in hot bodies of water worldwide, such as various "Naegleria" species. While studies have found the presence of "Naegleria" in hot spring waters, the worrisome "Naegleria fowleri" amoeba has not been identified. Nevertheless, fewer than five cases have been seen historically in Japan, although not conclusively linked to onsen exposure. Many onsens display notices reminding anyone with open cuts, sores, or lesions not to bathe.