Monument Valley is a region of the Colorado Plateau in the southwestern United States, located in southeastern Utah and northeastern Arizona. It is known for its iconic sandstone buttes, mesas, and other rock formations. The area is part of the Navajo Nation Reservation and is a popular tourist destination. The term 'Mesas' is used to describe the flat-topped hills or mountains that are common in Monument Valley. These mesas are some of the most recognizable sights in the area and are a major draw for visitors.