General terms:
* Isthmus: This is the most common and specific term for a narrow strip of land connecting two larger landmasses, typically with water on either side. The Panama Canal cuts through the Isthmus of Panama, connecting the Atlantic and Pacific Oceans.
* Neck: This term can be used more generally than "isthmus" to refer to any narrow strip of land connecting two larger areas, even if there isn't water on both sides. For example, the neck of a peninsula.
* Corridor: This term implies a passageway or route, and can be used to describe a strip of land connecting two larger areas, especially if it's used for transportation or other purposes.
Other options:
* Land bridge: This term emphasizes the bridging function of the landmass, but is less specific than "isthmus."
* Passage: This term is less common but can be used if the strip of land is particularly narrow and difficult to traverse.
The best term to use will depend on the specific context and the nature of the landmass in question.
