an isthmus (IS-mus)
A land area bordered by water on three sides is called a peninsula. Peninsulas are landforms that extend into bodies of water, such as oceans, seas, or lakes, with water surrounding them on three sides. Examples include the Florida peninsula and the Iberian Peninsula in Europe.
Spain, or more generally, the Iberian peninsula. Although technically, the body of water north of Spain is the Bay of Biscay, not the Atlantic Ocean.
Land bordered by water on three sides
A bay is a body of water bordered on 3 sides by land, and by definition the "4th side" is the ocean. Whether it is saltwater or freshwater will depend on where the water is from. If the bay is of an ocean, it will be of saltwater. If it is of a freshwater lake or river, it will be of freshwater.
A peninsula
Atlantic Ocean
Atlantic ocean to the west and south and Indian ocean to the east.
Penensula
The Atlantic ocean bordered the colonies on the east.
The Gulf of Mexico bordered Aztec land to the east and the Pacific Ocean bordered Aztec land to the west.
Sounds like Florida.
No, a mainland is a large continuous land mass that is not surrounded by water on all sides. A peninsula is a landform that is surrounded by water on three sides.