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Region
- MassachusettsStellwagen Bank National Marine Sanctuary19
- Stellwagen Bank National Marine Sanctuary (Mass.)19
- Long Island Sound (N.Y. and Conn.)10
- Pacific Coast (Calif.)9
- Stellwagen Bank7
- Massachusetts Bay (Mass.)6
- MassachusettsMassachusetts Bay6
- Iowa4
- North Pacific Ocean4
- San Francisco Bay (Calif.)4
- CaliforniaSan Francisco Bay3
- Tahoe, Lake (Calif. and Nev.)3
- Great Salt Lake (Utah)2
- HawaiiKilauea Volcano2
- HawaiiMauna Loa (Hawaii Island)2
- Kilauea Volcano (Hawaii)2
- Mauna Loa (Hawaii Island, Hawaii)2
- Michigan, Lake2
- Santa Barbara Channel (Calif.)2
- Africa, Southern1