The Rio Grande (Rio Grande River), which is also known as Rio Bravo del Norte in Mexico, separates the state of Texas from Mexico and comprises a large part of the US-Mexican border - 2,019 kilometers (1,254 miles) out of a border of 3,141 kilometers (1,952 miles).
The boundary follows the middle of the Rio Grande - according to the 1848 Treaty of Guadalupe Hidalgo between the two nations, "along the deepest channel" - from its mouth on the Gulf of Mexico a distance of 1,254 miles (2,019 km) to a point just upstream of El Paso, Texas, and Ciudad Juarez, Chihuahua.
Bordering Texas and Louisiana is the Sabine River, the Red River borders Texas and Oklahoma, and between Texas and New Mexico/Mexico is the Rio.
The Rio Grande River forms the southwestern border of Texas, separating it from Mexico.
The Rio Grande forms part of the border between the US and Mexico.
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The Rio Grande forms part of the US border with Mexico, while the St. Lawrence River forms part of the border between the US and Canada.