Subject Region
United States
23
New York
9
France
6
India
6
California
5
New York (State)
4
Australia
3
Brazil
3
Germany
3
Mexico
3
Amazon River Region
2
Canada
2
China
2
Colorado River (Colo.-Mexico)
2
England
2
Europe
2
Germany (East)
2
Iran
2
Israel
2
Minnesota
2
Paris
2
Spain
2
Africa, Sub-Saharan
1
Alaska
1
Aldabra Island
1
Aleutian Islands
1
Amazonas
1
Amsterdam (Netherlands)
1
Arctic regions
1
Austin (Tex.)
1
Barcelona
1
Bedford-Stuyvesant (New York, N.Y.)
1
Bermuda Islands
1
Boston
1
British Columbia
1
Brooklyn (New York, N.Y.)
1
Calabria (Italy)
1
Camden
1
Chicago
1
Coeur d'Alene Mining District
1
Colombia
1
Copenhagen (Denmark)
1
Curitiba
1
Dominican Republic
1
East Hampton
1
Freiburg (Germany)
1
Galapagos
1
Germany (West)
1
Grand Marais
1
Great Barrier Reef (Qld.)
1
more ...