Place
- Minnesota1
- Mississippi1
- Missouri1
- Montana1
- Monterey Bay (Calif.)1
- Napa County (Calif.)1
- Narragansett Bay (R.I.)1
- Nebraska1
- Nevada1
- New Mexico1
- North Carolina1
- North Dakota1
- Ohio1
- Oklahoma1
- Pacific Grove (Calif.)1
- Pennsylvania1
- Point Lobos State Reserve (Calif.)1
- Puerto Rico1
- Saco Bay (Me.)1
- San Francisco Bay Area (Calif.)1