Located east of the provincial of Mae Hong Son this National Park a 396.60 km2 of rugged terrain. In a step to preserve representative natural features of this mountainous province, the park was established in 1981 as the 37th National Park of Thailand.

Topography
The park contains some of the more dominant peaks of the Thanon Tongchai mountain range with elevations varying between 300m. and 1700m. above sea level. These highlands give birth to numerous streams and small rivers which are important tributaries of the Pai river, the main river of this region.

Climate
The three distinct seasons of Northern Thailand offer varied conditions within Mae Surin Waterfall National Park throughout the year. With the mountain tops and river valleys often wreathed in mist, the cold season (Nov. – Feb.) affords beautiful scenery, lush vegetation, and comfortable temperatures for hiking and camping. This season is the favourite among tourists. The temperatures during the hot season (March – May) can be somewhat oppressive in the lowlands of Mae Hong Son with a mean high temperature of 39Celsius in the month of April Exploring the highlands or relaxing on the banks of the Pai river are a great way to beat the heat. With the majority of the 1230mm. Of annual rain falling during the months of June – October, the rainy season brings the forest into vibrant life and fills the rivers and their waterfalls to full capacity. While nature is at this time in its grandest state, hiking and travel are at most times troublesome at best. Careful planning should be made prior to visitation during this time of year to ensure safety.

Flora and Fauna
Within the borders of the park is a matrix of highly diverse habitat types ranging from the sparsely vegetated dry dypterocarp forest to lush and dense evergreen forest. Flora of interest are the famed Teak tree, stands of upland pine, and many species of orchid and wildflower, including an indigenous and rare Lady Slipper Orchid. Recent reported.

Sightings of animals of interest include: Malayan sun bear, serow, golden cat, common muntjac, gibbon, wild boar, python and cobra. The preliminary survey of species presence is currently under way, so little is known of the birdlife of the park. A computer generated list of possible species present identifies 386 species possible, and early results of the survey suggest highly diverse and abundant birdlife. Contact the headquarters for an updated bird list and information on good birding sites.