Question:  Cuyo Spanish was influenced by a dialect of the Spanish language spoken mainly in the areas in and around what Basin?
Sentence (from "Rioplatense Spanish"): "Rioplatense" Spanish (Spanish: "español rioplatense" , locally "castellano rioplatense") is a dialect of the Spanish language spoken mainly in the areas in and around the Río de la Plata Basin of Argentina and Uruguay.
Relevant evidence: Yes