IwateTravel

Yūgenkyū Cave (幽玄洞)

Flow of the course

Previous stop: A 90-minute round-trip boat cruise through cliffs 100 meters high, captivated by the boatman's traditional song "Geibi Oiwake"

About 15 min from the previous stop

About 45 min here

About 15 min to the next stop

Next stop: Touch the story of stone and Kenji Miyazawa in Higashiyama, where the poet worked as an engineer in his later years

About this spot

A stalactite cave right near Geibikei Gorge (猊鼻渓), it is introduced as "one of Japan's oldest stalactite caves" due to fossils of sea lily calyxes (がく) and other creatures discovered in layers dating back approximately 350 million years—a geological treasure trove. Inside the cave, stalactites and stalagmites lit by illumination stretch out, and at the back stands a crystal-clear underground lake in serene stillness. Traces of ancient sea creatures remain scattered on the cave walls, and following the guide plaques as you walk creates the sensation of a grand time journey—realizing this place was once the ocean floor. The cave maintains a nearly constant temperature year-round, feeling refreshingly cool in summer and pleasantly warm in winter. With a moderate size and well-maintained passages, it's the perfect "exploration" spot to visit casually after the boat cruise.

Tips

About 5 minutes by car from the Geibikei boat boarding point, with free parking. The cave floor is wet in places, so wear non-slip shoes. Watch your head in low-ceiling areas. At about 15 degrees even in summer, a light jacket will make you more comfortable.