Oyasukyo Gorge
This is a roughly eight kilometer long valley in Kurikoma Quasi-National Park, in Yuzawa City, Akita Prefecture. It offers views of various waterfalls, including Fudo-no-taki and Yakushi-no-taki. It's also famous for its fall leaf viewing, and its well-maintained trails make it a popular sightseeing spot. You can find Oyasukyo Onsen upstream, as well.