Phu Ruea, is a 1365 m high mountain in Loei Province, Thailand. It is located in Phu Ruea District, giving its name to the district. This mountain is part of the Phetchabun Mountains, a massif forming a natural boundary between North Thailand and Isaan. The peak rises 7 km north of Highway 203, between Loei town and Phetchabun and it is a good lookout to view the Mekong and the Hueang River valleys. The name of the mountain comes from the fact that it looks like a boat upside down from certain angles.
The Phu Ruea High Altitude Agricultural Research Station and the Phu Ruea National Park are located in the area around the mountain. The park borders Sainyabuli Province in Laos at its northern end. Most of the mountain is covered in mixed evergreen forest. The area around the mountain is part of the Luang Prabang montane rain forests ecoregion.
