Dinosaur National Monument is a U.S. National Monument located on the southeast flank of the Uinta Mountains on the border between Colorado and Utah at the confluence of the Green and Yampa Rivers. Although most of the monument area is in Moffat County, Colorado, the Dinosaur Quarry 40°26′29″N 109°18′04″W is located in Utah just to the north of the town of Vernal, Utah. The nearest communities are Jensen, Utah and Dinosaur, Colorado.