Region
West (U.S.)
17
Columbia River
11
Missouri River
11
North America
6
United States
4
États-Unis (Ouest)
3
West United States
3
Columbia (Fleuve)
2
Missouri (Rivière)
2
The West
2
Allegheny River Valley (Pa. and N.Y.)
1
Canada
1
Great Plains
1
Louisiana
1
Mississippi River
1
Mississippi River Valley
1
Monongahela River Valley (W. Va. and Pa.)
1
Northwest, Pacific
1
Ohio River
1
Ohio River Valley
1
The West (U.S.)
1
West Indies
1