Phu Hin Rong Kla National Park. The area covered by the two marks is Amphoe Dan Sai Loei province and Nakhon Thai district. Phitsanulok. Phu Hin Rong Kla is a source of history.Conflict of ideology and ideas that led to the loss of blood. Life and tears. History that occurred at the property, as well as conditions in the building will be preserved.Cause loss invaluable. Due to political dissent. Unity of the nation. An area of approximately 191,.875 acres or 307 square kilometers.