Body of water that serves as a geographic boundary

One prominent example of a body of water that serves as a geographic boundary between two nations is the Rio Grande. This river forms part of the border between the United States and Mexico. Stretching approximately 1,885 miles, the Rio Grande begins in the San Juan Mountains of Colorado and flows southward, eventually emptying into the Gulf of Mexico. As a natural boundary, the Rio Grande has significant historical, cultural, and political importance. It delineates the territory of the two countries and has been a focal point for discussions on immigration, trade, and environmental issues. The river's course and flow can also influence the interpretation of the border due to its changing nature over time, making it a dynamic and sometimes contentious geographic boundary.           33.

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