The natural feature that lies between the U.S. and Canada is the Great Lakes. This chain of five lakes—Superior, Michigan, Huron, Erie, and Ontario—forms the largest group of freshwater lakes in the world by total area. They serve as significant waterways for transportation, commerce, and recreational activities. The region surrounding the Great Lakes is also ecologically rich, supporting diverse ecosystems. These lakes play a vital role in the climate and economy of both countries, highlighting the importance of this natural boundary in terms of environmental and geopolitical significance.