Located at the heart of Phong Nha, The Dark Cave (Hang Tối) was discovered in 1990. This 6-kilometer-long cavern is renowned for its pristine darkness, untouched by artificial light. Visitors are drawn to its therapeutic mud baths and the serene waters of the Chay River, ideal for kayaking and swimming. For travelers starting from Hue, a tour of The Dark Cave promises an exceptional adventure into this natural wonder. Embark on an unforgettable expedition into the depths of darkness and uncover the revitalizing marvels that The Dark Cave offers.