The Treaty of Guadalupe Hidalgo
It's an administrative area or boundary in the southwest around these states: Arizona New Mexico Oklahoma Texas
The Rio Grande River (Rio Bravo as known in Mexico) forms a natural boundary between the southwestern United States and Mexico; however it is not a waterway as the river is not navigable.
The Treaty of Guadalupe Hidalgo settled the boundary dispute between the United States and Mexico.
The border
Most of the Mexico-Belize border is defined by the Hondo River (Spanish: Rio Hondo).There is however, a Rio Hondo located in the US State of New Mexico, but it doesn't define any boundary with the country of Mexico.
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Mississippi
Rio Grande
The Rio Grande river.
Rio Grande
Rio Grande
Rio Grande