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 686km2. In a mountainous area, the park borders Laos and Cambodia. Natural features include the cliffs at Pha Phueng, and the 40m Bak Teo Yai Waterfall. In 2004, a specimen of a new frog species, Fejervarya triora, was discovered in the park.
