Subregions- Alabama
 - Anticosti Island, Quebec, Canada
 - Arizona
 - Arizona-Sonora border region
 - Arkansas
 - Arkansas-Oklahoma border region
 - Bahama Islands
 - Bay of Campeche
 - Cape Girardeau, Missouri region
 - central Mexico
 - central Texas
 - Chesapeake Bay region
 - Chihuahua, Mexico
 - Colorado
 - Davis Strait
 - eastern Missouri
 - eastern Quebec, Canada
 - Florida-Georgia border region
 - Florida Peninsula
 - Gaspe Peninsula, Quebec, Canada
 - Georgia, USA
 - Gulf of Maine
 - Gulf of Mexico
 - Gulf of St. Lawrence
 - Hebgen Lake region
 - Hudson Bay
 - Hudson Strait region, Canada
 - Illinois
 - Indiana
 - Iowa
 - Iowa-Missouri border region
 - Jalisco, Mexico
 - Kansas
 - Kentucky
 - Labrador, Newfoundland and Labrador, Canada
 - Labrador Sea
 - Louisiana
 - Louisiana-Texas border region
 - Maine
 - Manitoba, Canada
 - Michigan
 - Minnesota
 - Mississippi
 - Missouri
 - Missouri-Arkansas border region
 - Missouri-Kansas border region
 - Montana
 - near the coast of Texas
 - Nebraska
 - New Brunswick, Canada
 - Newfoundland, Newfoundland and Labrador, Canada
 - New Jersey
 - New Mexico
 - New Mexico-Chihuahua border region
 - New York
 - North Carolina
 - North Dakota
 - northern Mexico
 - northern Quebec, Canada
 - Nova Scotia, Canada
 - off the east coast of the United States
 - Ohio
 - Oklahoma
 - Ontario, Canada
 - Pennsylvania
 - Prince Edward Island, Canada
 - Saskatchewan, Canada
 - South Carolina
 - South Dakota
 - southeastern Missouri
 - southern Idaho
 - southern Illinois
 - southern Indiana
 - southern New England
 - southern Ontario, Canada
 - southern Quebec, Canada
 - southern Texas
 - Tennessee
 - Texas-Mexico border region
 - Texas Panhandle region
 - Utah
 - Veracruz, Mexico
 - Vermont - New Hampshire region
 - Virginia
 - western Florida
 - western Texas
 - West Virginia
 - Wisconsin
 - Wyoming
 - Yellowstone region, Wyoming

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