What is defined as a narrow strip of land bordered by water, connecting two larger land areas?

The correct answer is an isthmus. An isthmus is a geographical feature characterized as a narrow strip of land that connects two larger land areas, with bodies of water on either side. This definition captures the essence of an isthmus, as it serves a vital role in linking larger geographic regions and can often facilitate trade and movement between the two land masses.

In this context, the other options describe different geographical features. A strait is a narrow body of water that connects two larger bodies of water and is not a land form. An island is a piece of land completely surrounded by water, while a peninsula is a land mass that is surrounded by water on three sides but still connected to the mainland. The distinguishing trait of an isthmus is its function as a land connector, emphasizing its role in bridging two larger regions.