Phu Pha Yon national park

Phu Pha Yon national park covers 829 square km. of land straddling 3 provinces in northeast of Thailand; Sakon Nakorn, Nakorn Phanom and Mukdahan. The Phu Pha Yon national park was formerly called Huay Huat; in August 28, 2000 the name was changed to Phu Pha Yon after an outstanding cliff with ancient paintings on it.

The Phu Pha Yon national park is part of the Phu Phan mountain range in Sakon Nakhon, Nakhon Phanom and Mukdahan provinces, with elevations up to 600 meters above sea level. The hills in the Phu Pha Yon national park are sources of water for several river streams including Huai Sai Noi and Huai Bang Sai. Huay Huat reservoir in the park is a popular spot for the local people. Around the reservoir are very beautifully shaped rock formations. Highlight beauty of the place is the purple flower called Dohk Du Si Ta which blooms in the rainy season.

May - October is the rainy season with August being the wettest month. Cool season is November - January with average minimum temperature being 16º C. February - May is hot season when the average maximum temperature could be 32 - 36º C.