We invite all runners to join us in closing the 4th field of the Tri Burapha series, 4 fields, 3 provinces in the eastern region, the final field at the land of butterflies in the eastern forest. Pang Sida Camp Trail is the most beautiful time of this place. "Butterfly city of the eastern forest" is the nickname of “Pang Sida National Park” is home to more than 500 species of butterflies, making it one of the top butterfly-watching spots in Thailand, which is full of charm.