The Hopi are a group of indigenous Native American people who primarily live on the 2,531.773 sq mi (6,557.262 km²) Hopi Reservation in northeastern Arizona.

The Hopi Reservation is entirely surrounded by the much larger Navajo Reservation.

The two nations used to share the Navajo-Hopi Joint Use Area.

The partition of this area, commonly known as Big Mountain, by Acts of Congress in 1974 and 1996, has resulted in longterm controversy.