Region
- United States 8 results
- Africa 3 results
- New York 2 results
- New York (State) 2 results
- Asia 1 results
- Brazil 1 results
- China 1 results
- Columbia River Watershed 1 results
- India 1 results
- Manitoba 1 results
- Mexico, Gulf of 1 results
- Mississippi River 1 results
- New York Region 1 results
- Niger River Watershed 1 results
- Nile River Watershed 1 results
- Paraná (State) 1 results
- Peace River (B.C. and Alta.) 1 results
- Peace River Watershed (B.C. and Alta.) 1 results
- Philippines 1 results
- Yunan Xian 1 results