Region
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Pittsburgh
2
Pittsburgh (Pa.)
2
Poland
3
Prairie Crossing (Grayslake, Ill.)
2
Prince William Forest Park
1
Prince William Forest Park (Va.)
1
Puerto Rico
1
Québec (Province)
1
Québec (Province)
6
Reserva de la Biosfera Calakmul Region
1
Rio de Janeiro
1
Rio de Janeiro (Brazil)
1
Rio de la Plata Watershed (Argentina and Uruguay)
1
Río de la Plata Watershed
1
Rotterdam
3
Russia
2
Russia (Federation)
2
Sahel
1
Saint Louis
1
Saint Louis (Mo.)
1
Saint-Camille
1
Saint-Camille (Québec)
1
San Miguel Talea de Castro
1
San Miguel Talea de Castro (Mexico)
1
Sardinia (Italy)
1
Saudi Arabia
1
São Francisco River Watershed (Minas Gerais-Alagoas and Sergipe)
1
Scandinavia
4
Scanno
1
Scotland
1
Seattle
3
Seattle (Wash.)
2
Senegal
3
Shanghai
2
Sierra Leone
1
Sierra Nevada (Calif. and Nev.)
1
Singapore
5
Sitka
1
Slovakia
1
South Africa
14
South Asia
5
South China Sea Region
1
Southeast Asia
6
Southern Hemisphere
1
Southern States
1
Southwestern States
2
Spain
2
Study and teaching
1
Sudan
2
Sweden
6
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