| 1 | Rio Grande marks the border between Mexico and the USA. | |
| 2 | China's northeast with North Korea's boundary rivers. | |
| 3 | It once marked the border of Rome's empire, the easternmost edge of their domain. | |
| 4 | The Rio Grande marks the border between Mexico and the USA. | |
| 5 | The Rio Grande River forms a natural boundary between Mexico and the United States. |
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