Tham Pha Chan has an entrance 60m high and about 100m wide. A stream runs about 600m through a limestone karst and in the dry season it's possible to walk to the far side. At its western end there is a sandalwood Buddha image about 15m above the ground, hence the cave's name. To get here, head north towards Tham Pha Fa at around the Km 14 sign on Rte 12. When the road forks, head northwest for 9km to reach this cave.
Not far from Tham Pha Chan is the Nam Don Resurgence (ຂຸນນ້ຳໂດມ), a cave where the Nam Don (Don River) emerges from the ground. It's quite a physical marvel to see the water coming up and out from the cave, and the lagoon that sits at the bottom of the tall limestone karst is a beautiful swimming spot.
Unfortunately, both are accessed via a rough road that runs 9km north from about 10km east of the junction with Rte 13. Go by motorbike, tuk-tuk or arrange an English-speaking guide through Tha Khaek's Tourist Information Centre.