Phu Soi Dao mountain with a flat top cut sandstone resembles a mountain in the Northeast. But to create a highly Phu Soi Dao is seen to be " Lan Son, Phu Soi Dao " is dense with fir trees ranged over a thousand acres. Which was named as yard care, the largest in Thailand. It is the second yard care.Because the yard care that ranged across two Thailand - Laos as well.