Taenoyu is a renowned hot spring inn located in Towada-Hachimantai National Park, Semboku City, Akita Prefecture. Established in 1952, this historic hot spring resort sits at approximately 700 meters elevation at the foot of Mount Nyuto, known for its nipple-like shape.

The inn's most distinctive feature is its location along the Sendatsu River, offering a unique bathing experience with the sound of flowing water and waterfalls. Taenoyu boasts two different natural hot spring sources called "Gold Yu" (golden hot spring) and "Silver Yu" (silver hot spring), each with completely different mineral compositions and therapeutic effects. The mixed outdoor bath along the river is particularly popular, allowing guests to bathe while listening to the waterfall sounds and feeling the river mist. Women can wear bath towels, and there are dedicated women-only bathing hours.

The scenery is characterized by pristine beech forests, offering stunning views throughout the four seasons. Autumn foliage is spectacular, while the fresh green of spring creates a refreshing atmosphere. Winter bathing in the snow-covered landscape provides a magical experience, with each season offering its unique charm.

Among the seven hot spring inns in Nyuto Onsenkyo, Taenoyu is especially popular with female guests due to its modern Japanese aesthetic, attentive service, and the synergistic effects of its two different spring sources. The inn has received high ratings from international visitors and offers English-language support.