Place
- Eritrea10
- Finland10
- Freshwater Creek (Calif.)10
- Jackson Demonstration State Forest (Calif.)10
- Lake County (Calif.)10
- Liberia10
- Machias Bay (Me.)10
- Madagascar10
- Malawi10
- Mauritania10
- Mono County (Calif.)10
- Narragansett Bay (R.I.)10
- Polar regions10
- Spain10
- Turkey10
- Angola9
- Block Island Sound (R.I.)9
- Blue Hill Bay (Me.)9
- Congo9
- Ipswich Bay (Mass.)9