Wat Pa Boonnak Wat Boonnak is the oldest Temple in Phayao Province. It was joined togather then know as Wat Paeng Boonnak. There are seperated by the wall between two temples.At the side of the temple in the woods is Wat Bunnak is an old temple in Phayao. When walking into the forest, you will find the ancient ruins of Wat Boonnak. The ancient pagoda, Sukhothai art, basilica, ruins, ancient walls. And 25 ancient remains.