The lit cave
The electrically lit walk about 4 km from the falls. The rough Ban Thuon branch is a different visit.
Nguom Ngao is in Ban Gun, Dam Thuy. Vietnam Tourism says the system is 2,144 m, with 948 m open to ordinary visitors, about an hour or more for a one-kilometre walk. The geopark says more than 2,000 m and three mouths: Nguom Ngao, Nguom Lom, and Ban Thuon. The Ban Thuon branch, nearly 3 km, opened for a rougher visit with climbing and wading.
