It is located about 3 km (2 miles) from Anouvong district, Xaisomboun province.
Nearby Phou Bia Mountain is 2,819 m (9,249 ft) high.
The cave is about 100 meters long, and offers two exits on the other side of the cliff.
The prince was born in 1767 in Vientiane and died in 1828 in Thailand, killed by the Royal Thai Army.
The cave was discovered and after the Siamese occupied the kingdom of Vientiane and Champasak.