Generally the forested areas of the Phi Pan Nam are known for their teak and bamboo forest.
The mountain ranges are covered with tropical dry broadleaf forests, including sections of moist evergreen forest, mixed deciduous forest, dry deciduous forest, as well as hill evergreen forest at higher altitudes.
There is great biodiversity in these mountains and their few unspoilt valleys, with a wide range of animal and plant species.
The whole area of the range is part of the Central Indochina dry forests ecoregion.

There are a number of protected areas in the Phi Pan Nam mountains, mostly encompassing mountainous terrain.
These are patchily distributed across the range, and the largest national parks are in its central part, roughly around Phayao town.
Protected sectors are typically surrounded by agricultural zones, often near roads and villages and thus with vast surfaces under the influence of the edge effect.

Besides the national parks and wildlife reserves, there are the Huai Tak Teak Biosphere Reserve in Lampang Province and the Phu Langka Forest Park, located in Chiang Kham District and Pong District of Phrae Province.
The main attractions of the forest park are Doi Hua Ling, Doi Phu Lang Ka and Doi Phu Nom; the latter is a breast-shaped hill rising in an area of grassland.
Generally the forested areas of the Phi Pan Nam are known for their teak and bamboo forest. The mountain ranges are covered with tropical dry broadleaf forests, including sections of moist evergreen forest, mixed deciduous forest, dry deciduous forest, as well as hill evergreen forest at higher altitudes. There is great biodiversity in these mountains and their few unspoilt valleys, with a wide range of animal and plant species. The whole area of the range is part of the Central Indochina dry forests ecoregion.
There are a number of protected areas in the Phi Pan Nam mountains, mostly encompassing mountainous terrain. These are patchily distributed across the range, and the largest national parks are in its central part, roughly around Phayao town. Protected sectors are typically surrounded by agricultural zones, often near roads and villages and thus with vast surfaces under the influence of the edge effect. 
Besides the national parks and wildlife reserves, there are the Huai Tak Teak Biosphere Reserve in Lampang Province and the Phu Langka Forest Park, located in Chiang Kham District and Pong District of Phrae Province. The main attractions of the forest park are Doi Hua Ling, Doi Phu Lang Ka and Doi Phu Nom; the latter is a breast-shaped hill rising in an area of grassland.
Phi Pan Nam Range