Tropical montane forests are on top of over-1000-meter mountains. The moist climate allows moss, fern and lichen to thrive. Pine forests can be found sparsely on area mountains as well. Along the riverbanks are wet tropical while mixed deciduous and dry dipterocarp forests can be found in semi-arid area with some teak trees.
Some unspoiled forests have been included in preservation areas, such as Doi Luang, and Khun Chae National Park , as well as Khun Kon Botanical Garden . These forests are sourced of Chiang Rai waterways and their fauna. Many beautiful waterfalls originated in this areas such as Khun Kon and Pu Kaeng.
In Nong Bong Khai Sanctuary in Amphoe Chiang Saen live a large flock of birds, especially cold-weather ducks and teals on their annual migration from the freezing climate in northern Asia .