Preserve, northeastern Arizona, U.S. Located on the Navajo Indian reservation immediately east of Chinle, the preserve was established in 1931 and occupies 131 sq mi (339 sq km).
It includes several hundred pre-Columbian cliff dwellings, some of them built in caves on the canyon walls. They represent a broader time span than any other ruins in the Southwest, with many dating from the 11th century. Modern Navajo homes and farms occupy the canyon floor.