Phu Wiang National Park (PWNP) is located in Phu Wiang District, Khon Kaen Province, northeastern Thailand. It is best known for its numerous dinosaur bone paleontological sites, The park is one of the world's largest dinosaur graveyards.[2] In 1996, the remains of Siamotyrannus isanensis, a new family of carnivorous thunder lizards, were unearthed in the park.