Region
Panama
5
Panama Canal (Panama)
5
Canal Zone
4
Bangladesh
2
United States
2
California
1
Holston River
1
Hudson River Watershed
1
Hudson River Watershed (N.Y. and N.J.)
1
Korea
1
Lesotho
1
Martin Garcia Island (Buenos Aires, Argentina)
1
Martín García Island (Buenos Aires, Argentina)
1
Mexico, Gulf of
1
Netherlands
1
Nicaragua Canal (Nicaragua)
1
Rondout Creek Watershed (N.Y.)
1
Río de la Plata (Argentina and Uruguay)
1
San Francisco Bay
1
Tennessee River
1