What is defined as a narrow strip of land with sea on either side, linking two larger areas?

An isthmus is correctly defined as a narrow strip of land that connects two larger landmasses and is surrounded by water on both sides. This geographical feature often plays a significant role in trade and transportation, as it provides a natural route between two bodies of water, facilitating movement and economic exchange. Notable examples of isthmuses include the Isthmus of Panama, which connects North and South America and is crucial for maritime navigation via the Panama Canal.

In contrast, a peninsula is a landform that extends into a body of water, surrounded on three sides by water, which does not meet the definition of being a narrow strip linking two larger areas. A delta refers to a landform at the mouth of a river where it meets a body of water, formed by sediment deposition, while an archipelago is a group or chain of islands. Each of these features encompasses different geographical characteristics that do not align with the definition of an isthmus.