The Kling, Ruc Ca Roong and A Cu caves, located in Phong Nha-Ke Bang National Park in Quang Tri province, form part of a new eco-tourism project combining cave exploration with ancient stone cypress forests.
Reaching the caves requires trekking through moss-covered trails, crossing streams and navigating rugged limestone terrain typical of the park.
Kling Cave extends about 1 kilometres through a mountain, with ceilings up to 50 metres high and an underground stream flowing through it. Near the entrance, a sandy area beneath towering rock arches forms a natural campsite.
Deeper inside, large stalactites dominate the cavern, while a 30-metre rock face known as the Arem Wall offers a challenging, guided climb.
A Cu Cave, around 600 metres long, features dense formations of stalactites and stalagmites shaped over millions of years by geological processes and flowing water, creating a striking subterranean landscape.
Ruc Ca Roong Cave offers a quieter setting, with clear streams winding past large boulders, where visitors can swim, paddle and relax amid primary forest surroundings.
The route also passes former rock shelters once inhabited by the Arem people, now used as rest stops. The tour further includes exploration of centuries-old stone cypress trees clinging to steep cliffs, some estimated to be over 500 years old.