A peninsula is a geographical formation consisting of an extension of land from a larger body that is surrounded by water on three sides.
A peninsula could also be a headland, cape or spit.
- Baja California, Mexico, containing the states of Baja California and Baja California Sur
- Barrio Obrero, Puerto Rico, despite its name, it is also a peninsula
- Cape Cod in Massachusetts
- Delmarva Peninsula, containing parts of Delaware, Maryland, and Virginia
- Florida Peninsula, comprising most of the state
- Northern Neck, Middle Peninsula, and Virginia Peninsula, on the western shore of Chesapeake Bay in Virginia
- Olympic Peninsula in Washington
- Paraguana, Venezuela
- San Francisco Peninsula, partly separating the San Francisco Bay from the Pacific Ocean
- Upper Peninsula of Michigan and the Lower Peninsula of Michigan in the Great Lakes
- Pinellas Peninsula, separating Tampa Bay from the Gulf of Mexico, comprising Pinellas County
- Yucatán Peninsula, partly separating the Gulf of Mexico from the Caribbean Sea