The Gulf of Mexico
The gulf that forms part of the southern border of the United States is the Gulf of Mexico
The U.S. southern border is formed by Mexico and the Gulf of Mexico.
The U.S. southern border is formed by Mexico and the Gulf of Mexico.
Southern Alabama touches the Gulf of Mexico. Alabama's beach vacation areas on the Gulf of Mexico include Gulf Shores and Orange Beach.
The Gulf of Guinea forms the southern coast of Nigeria. It is part of the Atlantic Ocean and stretches along the country's coastline from the western to the eastern border.
Rio grande
Florida
the Rio Grande
Florida.
The Rio Grande
Rio grande
columbia river