An isthmus is a narrow strip of land that connects two larger landmasses and is surrounded by water on both sides. This geographical feature plays a crucial role in trade and transportation, as it often serves as a shortcut for ships traveling between two bodies of water. A well-known example is the Panama Isthmus, which connects North and South America and is home to the famous Panama Canal. Isthmuses can also be important for biodiversity, as they often host unique ecosystems. The Tehuantepec Isthmus in Mexico, for instance, is a vital area for various plant and animal species. These landforms can also influence weather patterns and migration routes for wildlife, making them significant in both ecological and geographical studies.