Region
- United States 444 results
- Great Britain 32 results
- Germany 30 results
- Colorado 25 results
- Developing countries 10 results
- England 9 results
- Russia (Federation) 9 results
- Africa 8 results
- California 8 results
- Hampton Roads (Virginia) 8 results
- Iraq 7 results
- James River (Virginia) 7 results
- Korea (South) 7 results
- North Carolina 7 results
- Chowan River 6 results
- Virginia 6 results
- Wilmington, North Carolina 6 results
- Beaufort, North Carolina 5 results
- Cape Fear River (North Carolina) 5 results
- Europe 5 results
- France 5 results
- Israel 5 results
- Japan 5 results
- New York (State) 5 results
- Norfolk, Virginia 5 results
- Roanoke River 5 results
- York River (Virginia) 5 results
- Asia 4 results
- Bodie Island (North Carolina) 4 results
- Former Soviet republics 4 results
- Plymouth, North Carolina 4 results
- Soviet Union 4 results
- China 3 results
- European Union countries 3 results
- Foreign countries 3 results
- Ireland 3 results
- Massachusetts 3 results
- New Bern, North Carolina 3 results
- North America 3 results
- Pamunkey River (Virginia) 3 results
- Washington (D.C.) 3 results
- Washington, North Carolina 3 results
- Africa, Sub-Saharan 2 results
- Australia 2 results
- Blackwater River (Virginia) 2 results
- Brazil 2 results
- Canada 2 results
- Canal Zone Biological Area 2 results
- Caribbean Area 2 results
- Charleston, South Carolina 2 results more…