West Mitten - Monument Valley Navajo Tribal Park, UT and AZ. Monument Valley is a wide, flat landscape punctuated by colorful buttes and spires that are hundreds of feet high. These are the last remnants of sedimentary rock layers that once covered the region. The area is located entirely within the Navajo Indian Reservation and was used by early Hollywood directors as a background for western films.Photo: Russ Finleyscenic, clouds Film Size 6X7cm