Nestled within the lush landscapes of Okinoerabu Island in Kagoshima Prefecture, Ōyama Suikyō-dō stands as Japan’s second-longest limestone cave, extending over 10 kilometers. This subterranean marvel offers a unique blend of natural beauty and adventure, attracting explorers and nature enthusiasts alike.

The cave boasts a variety of stunning features, including rimstone pools, cave pearls, and intricate stalactites and stalagmites. Guided caving tours, such as the beginner-friendly “Rimstone Course” and the more challenging “Daijadō” and “Ginsuidō” routes, allow visitors to experience the cave’s wonders firsthand.

Participants can expect to navigate through narrow passages, wade through underground streams, and witness breathtaking formations illuminated by headlamps. The Ginsuidō section, in particular, is renowned for its emerald-lit pools and massive white stalactites, offering a surreal and unforgettable experience.

Beyond its geological allure, Ōyama Suikyō-dō holds historical significance, with archaeological discoveries such as ancient pottery and human fossils dating back thousands of years.

Whether you’re an adventure seeker or a history buff, a visit to Ōyama Suikyō-dō promises an extraordinary journey into the heart of Japan’s natural and cultural heritage.