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OpenStudy (anonymous):

What natural boundary helps form the border between the United States and Mexico? Gulf of Mexico Atlantic Ocean Great Lakes Rio Grande

OpenStudy (barreraa):

Rio Grande River. The Rio Grande River flows from its headwaters in the San Juan Mountains of southern Colorado to the Gulf of Mexico near Brownsville, Texas. Also known as the Rio Bravo in Mexico, the river forms a natural boundary between the USA and Mexico

OpenStudy (barreraa):

In Mexico they call it Rio Bravo

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