Straits and isthmuses are important features of the world's geography that have significant implications for international trade.

 

Straits are narrow bodies of water that connect two larger bodies of water, such as oceans or seas. They can serve as important trade routes, as they provide a shorter and often more convenient route for ships to travel between different regions. For example, the Strait of Malacca is a key trade route that connects the Indian Ocean with the Pacific Ocean, and the Strait of Gibraltar connects the Mediterranean Sea with the Atlantic Ocean. These straits are used by ships from all over the world to transport goods between different regions.

 

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Isthmuses are narrow strips of land that connect two larger land masses, such as continents. They can also serve as important trade routes, as they provide a shorter and more convenient route for land-based transportation of goods between different regions. For example, the Isthmus of Panama connects North and South America and is a major trade route for the transportation of goods between the two regions.

 

Overall, straits and isthmuses are important features of the world's geography that have significant implications for international trade. They provide shorter and more convenient routes for the transportation of goods between different regions, and are used by ships and land-based vehicles to transport a wide variety of goods.