Phu Suan Sai National Park, formerly known as Na Haeo National Park, is located in the Na Haeo District of Loei Province. It was officially renamed on March 14, 2006, as the name Phu Suan Sai refers to the most prominent mountain in the park area. Within Phu Suan Sai National Park, there are four rocks that symbolize the traditions and culture of the local people. The park features historical sites such as Hill 1255 and Hill 1408, which are significant landmarks from the battlefield of Ban Romklao. At Phu Suan Sai, visitors can find breathtaking viewpoints and experience a rich biodiversity that enhances the natural beauty of this remarkable destination.