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Rio Grande Valley is a term used in the communities along the Rio Grande to denote the river valley carved by the river, including the Middle Rio Grande Valley in New Mexico, and parts of this valley that are known by other names, such as the Mesilla Valley.

The term is also used to denote the Lower Rio Grande Valley, a socio-economic region in southern Texas and Northeast Mexico. In this region, the Rio Grande forms a wide fertile floodplain rather than a hydrological 'valley'. Nevertheless, the name has persisted.