Postcard of Pedro, a Navaho Indian. ca. 1924, Pedro, A Navaho Indian, New Mexico. The Navaho Reservation in northern Arizona is one of the largest in the United States and contains about 16,000 Indians. The territory covered by this reservation is extremely diversified in character. In the country along and to the north of the Little Colorado river are broad valleys and rolling prairies, with mesas and buttes rising up here and there, while east and north it is very broken, with high table-lands