Region
West (U.S.)
United States
685
United States, West
255
California
85
West United States
56
North America
53
Great Basin
51
Colorado River Watershed (Colo.-Mexico)
50
Canada, Western
36
Missouri River
31
Oregon National Historic Trail
30
Texas
30
Colorado River Watershed
29
Utah
29
Colorado
25
Nevada
25
Pacific States
25
Columbia River
24
New Mexico
24
Southern States
24
Rocky Mountains
23
Mexico
22
Great Plains
21
Yellowstone National Park
19
Colorado River (Colo.-Mexico)
18
Mississippi River Valley
18
Missouri
18
Montana
18
Southwest, New
18
Wyoming
18
Oregon
17
Canada
15
Middle West
14
Northwest, Canadian
14
Alaska
13
Arizona
13
Idaho
10
Santa Fe National Historic Trail
10
West (U. S.)
10
Northwest, Pacific
9
America
8
Hawaii
8
Kansas
8
Mississippi River
8
Southwestern States
8
Columbia River Watershed
7
Louisiana
7
North Dakota
7
Saint Louis (Mo.)
7
Washington (State)
7
more ...