Place
- Mid-Atlantic Region1
- Minnesota1
- Mississippi1
- Missouri1
- Monhegan Island (Me.)1
- Montana1
- Montauk (N.Y.)1
- Muscongus Bay (Me.)1
- Nantucket (Mass.)1
- Nantucket Harbor (Mass.)1
- Nebraska1
- Nevada1
- New Mexico1
- New York1
- New York Bight (N.J. and N.Y.)1
- New York State Canal System (N.Y.)1
- North Atlantic Region1
- North Carolina1
- North Dakota1
- Ohio1