Navajo County, Arizona
Navajo County offers not only the Monument Valley, but Keams Canyon, part of the Petrified Forest National Park, and one of the largest contiguous ponderosa pine forest in North America. Navajo County has of federally designated Indian reservation within its borders, the third most of any county in the United States (neighboring Apache County and Coconino County are first and second). In descending order of territory within the county, the reservations are the Navajo Nation, Hopi Indian Reservation, and Fort Apache Indian Reservation, all of which are partly located within Navajo County.As of the 2000 census, there were 97,470 people, 30,043 households, and 23,073 families residing in the county. The population density was 10 people per square mile (4/km²). There were 47,413 housing units at an average density of 5 per square mile (2/km²). The racial makeup of the county was 47.74% Native American, 45.91% White, 0.88% Black or African American, 0.33% Asian, 0.05% Pacific Islander, 3.15% from other races, and 55.94% from two or more races. 8.22% of the population were Hispanic or Latino of any race. 24.77% reported speaking Navajo at home, 5.94% other Southern Athabaskan languages, 4.71% Spanish, and 3.23% Hopi.
Mohave County, Arizona
The county consists of two sections divided by the Grand Canyon, with no direct land communication between them. The northern section, smaller and less populated, forms the western part of the Arizona Strip, bordering Utah and Nevada. The larger southern section borders Nevada and California across the Colorado River, which forms most of the county's western boundary. The southern section includes Kingman, the county seat, and other cities, as well as part of the Mojave Desert.Mohave County and its adjacent counties form the largest such block of counties outside of Alaska. Their combined land area is , or larger than that of the state of Idaho. They include the #1 (San Bernardino), #2 (Coconino), #5 (Mohave), and #7 (Lincoln) largest counties outside of Alaska.There are 18 official wilderness areas in Mohave County that are part of the National Wilderness Preservation System. Most of these are managed by the Bureau of Land Management, but some are integral parts of the preceding protected areas, or have shared jurisdiction with the BLM. Some extend into neighboring counties (as indicated below) All wilderness areas within Grand Canyon-Parashant NM are managed by BLM, although the National Monument shares management with the National Park Service: