The geographic term that describes a narrow strip of land connecting two larger areas is an isthmus. Isthmuses are often critically important for trade and transportation, as they provide direct routes between major land masses. One of the most famous examples is the Pana​ma Isthmus, connecting North and South America, which is also home to the strategically significant Panama Canal. Isthmuses can also create unique ecosystems, influencing biodiversity in the areas covered by land on either side.