Doi Inthanon is the highest mountain in Thailand, 2,565 m. from sea level.The geography is bountiful with foresst and the atmosphere is cool and fresh all year. The weather is cold with high humidity throughout the year, particularly at the top of the National Park. In winter, the temperature at the National Park is below 0 c and the mountain is covered with fog all day. In summer, despite hot weather in central Chiang Mai and nearby districts, it is still freezing. Visitors to the peak of Doi Inthanon should be prepared with thick clothes. In the park are many attractive waterfalls and caves such as : Mae Ya Waterfall (the most beautiful waterfall in Chiang Mai), Mae Klang Waterfall, Wachiratan Waterfall, Sririphum Waterfall, Huay Sai Luang Waterfall, Mae Pan Waterfall, Borijinda cave etc.
The forest in the park is one of the country’s very significance and valuable heritage. Forests include Moist Evergreen Forest, Pine forest and Mixed Deciduous Forest, worth in economic like teak and mountain pine. Dipterocarp spp. Xylia xylocarpa, Pterocarpus, macrocapus Terminalia sp. and Lagerstroemia sp. to name a few. In addition to these, there are many beautiful flowers including vanda orchid, phycastylis and rhododendron. Sphagnum Moss and osmanda fern are found at higher levels in the park. fifty years ago, the mountain peaks were home of hill tribe people. The biggest village was Ban Khun Klang, whose agriculture method was often destructive to the forest ecosystem. Currently the several Royal Projects, assists the villagers in growing cold-climate fruit such as strawberries, grapes and apples as well as flowers. The number of wild animals in the park is decreasing the encroachment. The animals are hunted and their habitats are destroyed for agriculture. The remaining animals include serpent, gibbons, tigers, deer, wild boars, Siamese hares and Red Jungle fowls.
Because of its broad altitudinal range and the cool climate of its upper reaches, the park supports the largest number of bird species of any site in Thailand. The Center for Wildlife Research at Mahidol University records a present total of 362 species and expects addition many at the summit are migrants from northern Asia. Species restricted to Doi Inthanon are Ashy-throated Warbler and an endemic race of the Green-tailed Sunbird; the park is the only site where the Chestnut-bellied Rock-Thrush and the Yellow-bellied Flower pecker are known to over summer and probably breed.