Region
Amazon River
1
America
20
Andes Region
1
Arctic regions
1
Argentina
4
Buenos Aires (Argentina)
1
Colorado River (Mendoza and Neuquén-Buenos Aires, Argentina)
1
Europe
1
Florida
1
Gran Chaco
1
Latin America
3
Mexico
2
Northwest Passage
1
Paraguay
3
Peru
2
Rio de la Plata (Argentina and Uruguay)
1
Southwestern States
2
Spain
11