Tham Phakounhuoay cave in Sainyabuli Province
35 km south of Sayaboury municipality. From Sayaboury Town rent a small motorbike or book tuk tuk and get ready for a ride along a mountainous road and across rivers until reaching Ban Nathang. Stop for lunch and a rest before embarking on a two-hour walk through rice paddies, forested hills (keep your eyes open for monkeys!), and rock formations. On the way visit Tham Phakounhuoay cave to view impressive limestone formations, and for the more adventurous and fit, follow the cave’s stream that runs for several kilometers through the extensive cavern network. After this venture, continue to the Khmu village of Ban Keo for dinner, Lao Hai (rice wine) and an overnight stay.
Location: Drive south past the Sayaboury bus station towards Paklai for some 10 km, and turn left at the signs for Ban Houaykeng.