The vast Tham Phu Kham is popular in lao. there have lake in the cave is The beautiful green-blue waters. in The main cave chamber contains a Thai bronze reclining Buddha, and from here deeper galleries branch off into the mountain. To get here, come along a scenic but unpaved road to the village of Ban Na Thong. From Ban Na Thong follow the signs towards the cliff and climb a stiff 200m through scrub forest.