Phu Chong–Na Yoi National Park
Phu Chong–Na Yoi National Park is a protected area at the eastern end of the Dângrêk Mountains, northeastern Thailand. It is in Buntharik, Na Chaluai, and Nam Yuen districts of Ubon Ratchathani Province. Established in 1987, it is an IUCN Category II protected area, measuring . In a mountainous area, the park borders Laos and Cambodia. Natural features include the cliffs at Pha Phueng, and the Bak Teo Yai Waterfall. In 2004, a specimen of a new frog species, "Fejervarya triora", was discovered in the park.