Place
- Albion River Watershed (Calif.)3
- Iceland3
- Mongolia3
- Argentina2
- Austria2
- Canada2
- Cape Cod Bay (Mass.)2
- China2
- Delaware Bay (Del. and N.J.)2
- Finland2
- Georges Bank2
- Jackson Demonstration State Forest (Calif.)2
- Maine, Gulf of2
- Marin County (Calif.)2
- Massachusetts Bay (Mass.)2
- Mexico2
- Nantucket Shoals (Mass.)2
- Puerto Rico2
- Rhode Island Sound (Mass. and R.I.)2
- Saint Kitts and Nevis2