Originally named Na Haeo National Park, it is located in the Na Haeo District of Loei Province. On March 14, 2006, the name was officially changed to Phu Suan Sai National Park, as Phu Suan Sai is the most prominent mountain in the area. The entrance fees are 20 baht for adults and 10 baht for children. Notable sites within the park include Hill 1255 and Hill 1408, which are historically significant as they were battlegrounds during the conflicts in Ban Rom Klao. The natural beauty here is truly captivating and rivals that of other renowned destinations.