isthmus

This term describes a specific geographical bottleneck that creates a land bridge. It carries a technical, cartographic tone and is most frequently encountered in geography textbooks, historical accounts of trade routes, or geopolitical discussions regarding strategic transit points. While it shares a similar visual profile with a peninsula, an isthmus must connect two larger landmasses, whereas a peninsula is bounded by water on three sides and connected to only one larger landmass. It is a precise term used to distinguish a connecting strip from a protruding one.