What geographic feature provides an effective shipping route for paraguay uruguay and argentina? a) the pampasb) the pacific ocean c) the rio de la plata d) the andes

Answer is: c) the rio de la plata.
Rio de la Plata is the estuary formed by the confluence of the Uruguay (river in South America that flows from north to south and forms parts of the boundaries of Brazil, Argentina and Uruguay) and the Parana rivers (river in south Central South America, running through Brazil, Paraguay, and Argentina), empties into the Atlantic Ocean.
Río de la Plata has many ports.

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