Region
West (U.S.)
United States
679
United States, West
255
California
81
West United States
56
North America
53
Great Basin
51
Colorado River Watershed (Colo.-Mexico)
50
Canada, Western
34
Missouri River
30
Colorado River Watershed
29
Oregon National Historic Trail
29
Texas
29
Utah
29
Pacific States
25
Colorado
24
Columbia River
24
Nevada
24
New Mexico
24
Rocky Mountains
23
Southern States
23
Great Plains
20
Mexico
19
Yellowstone National Park
19
Colorado River (Colo.-Mexico)
18
Mississippi River Valley
18
Missouri
18
Southwest, New
18
Wyoming
18
Oregon
17
Montana
16
Canada
15
Middle West
14
Northwest, Canadian
14
Alaska
13
Arizona
12
Santa Fe National Historic Trail
10
West (U. S.)
10
Idaho
9
America
8
Hawaii
8
Mississippi River
8
Northwest, Pacific
8
Columbia River Watershed
7
Kansas
7
Louisiana
7
North Dakota
7
Saint Louis (Mo.)
7
Southwestern States
7
Washington (State)
7
more ...