The Río Blanco (Spanish for "white river") is a river of Argentina near Calingasta in the southwestern part of the province of San Juan. It is a tributary of the Río de los Patos which is one of the three sources of the San Juan River which empties into the Desaguadero River basin.

• List of rivers of Argentina

• Rand McNally, The New International Atlas, 1993.
• GEOnet Names Server

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