Khao Ko is not the only attraction in Petchabun province. There is Phu Tubberg, the tallest mountain in Petchabun province. From high up here, you can look out as far as your eyes can see at the other surrounding mountains.
Phu Tubberg stands 1,768 meters (5,800 ft.) above sea level. On this mountain live the Hmong people. In the older days, they would cultivate poppy to produce opium. Since its restriction, the Hmong have turned to planting a different type of vegetation. Can you guess what it is?