Хуапхан
Houaphanh Province was noted for its "samana" ('re-education') camps. The Lao royal family were believed to have been taken to one such camp near Sop Hao in 1977. Crown Prince Say Vong Savang allegedly died at the camp in May 1978, followed by his father, King Savang Vatthana, of starvation 11 days later.