Isthmus is a narrow strip of land that connects two larger land areas and separates two bodies of water. It acts as a natural bridge between regions. Isthmuses can vary in width and may include hills, plains, or forests. They are often important routes for travel.

Isthmuses are found in different parts of the world, such as the Isthmus of Panama in Central America. They formed over long periods through natural processes. Isthmuses are important for land travel and human settlement. Some also have canals that allow ships to pass through.