Which river flows through Valladolid as a major tributary of the Duero?

Answer and explanation

Correct answer: A. Pisuerga

  1. Step 1: According to the official source: The Pisuerga is a river in northern Spain, the Duero 's second largest tributary . ... The river flows south into the Douro river shortly after passing through the city of Valladolid . Answer: Pisuerga. Why not the others: Nalon, Genil, and Tajo are other major Iberian rivers flowing through different valleys and drainage basins.

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