These amazing caves are situated to the south west of Vang Vieng and are accessed by a bridge over the Nam Song River. There is a small fee levied to enable crossing the bridge, but this is well worth it for the photo opportunity along the river. You make your way down a long flight of steps and see the spring that is situated 160 feet inside the cave. If you have snorkel gear with you, take it. This is the clearest water you will ever see and there is enough of interest to make carrying it, worthwhile. You can swim about 80 yards along into the cave. Just outside the cave there is a flight of steps that take you up to a viewing platform. This is well worth doing as it affords terrific views across the local countryside and of Vang Vieng.
The local caretakers have a neat way of ensuring people pay the admission fee. The caves are in darkness until you pay the small charge, then they turn the lights on! Immediately outside the cave there is a nice spot to enjoy a swim, there is no charge for this.
During the Ho invasion 200 years ago it was used as a hideout from the marauding Chinese forces. Tham Jang translates as the steadfast cave. The caves are steeped in history and are an incredible natural phenomenon. They are well worth a visit on your travels through this beautiful country.