Canyon de Chelly National Park is a unique park in the national park system. It is the only joint venture between the NPS and another group. The park is located completely on Navajo land. Even a few families live down in the canyon. The Navajo Nation and the National Park Service work together to manage this area. The Navajo protect the natural resources while the Park Service protects the archaeological sites. Northern Arizona University investigated the history of the archaeology inside of Canyon de Chelly National Park. For more information about the park, visit its website.