The highest number of dinosaur fossils have been found in the country of China. China has been a rich source of dinosaur fossils, with numerous significant discoveries made over the past several decades. Many dinosaur species, including some of the most well-known ones like Tyrannosaurus rex and Velociraptor, have been found in China. The country's diverse geological formations and extensive fossil deposits have contributed to its status as a significant location for dinosaur paleontology. Other countries, such as the United States, Argentina, and Mongolia, have also yielded significant dinosaur fossil discoveries, but China stands out for the sheer quantity and diversity of fossils found within its borders.