Sardón de Duero is a municipality in the province of Valladolid, Castile and León, Spain. According to the 2004 census, the municipality has a population of 668 inhabitants. There is a factory producing mantecadas in Sardón de Duero, as well as the Monastery of Santa María de Retuerta.
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Coordinates 41°36'30.669" N -4°26'2.157" E