Subject Region
United States
30
England
23
Great Britain
23
North America
8
Pennsylvania
8
New York (State)
7
California
6
Mississippi River
6
New York
6
Texas
6
Europe
5
Colorado River (Colo.-Mexico)
4
West (U.S.)
4
Africa
3
Earth (Planet)
3
East River (N.Y.)
3
Fens, The
3
India
3
Ireland
3
New Jersey
3
New Zealand
3
Québec (Province)
3
Regulation
3
Rome
3
Scotland
3
Wales
3
Alabama
2
Arizona
2
Atlantic Coast Region (U.S.)
2
Balim Valley (Indonesia)
2
Bedford Level
2
Bedford Level (England)
2
Brazil
2
Canada
2
Chester (England)
2
Cumberland Road
2
Driftless Area
2
Espana
2
Fens, The (England)
2
France
2
Glen Canyon Dam (Ariz.)
2
Grand Canyon
2
Houston (Tex.)
2
Hudson River (N.Y. and N.J.)
2
Indonesia
2
Los Angeles River (Calif.)
2
Maryland
2
Massachusetts
2
Minnesota
2
Netherlands
2
more ...