To commemorate the 2010 bicentennial of its salt mines, a polluted tributary of this river was dyed Uriburu Green. It’s not Tampa, but a city along this river created the longest continuous sidewalk in the world inspired by Barcelona’s Rambla. (10[1])A dialect named for this river (-5[1])is used by the poet Oscar Conde and includes terms named after “Lombard villainy.” (10[1])This river’s estuary is bounded by a line that runs from Cabo San Antonio to (10[1])Punta del Este. (10[2])The Admiral (10[1]-5[1])Graf Spee (10[2])was (10[2])scuttled in this river (10[4])after (10[1])the first naval (10[1])battle of World War II. The most (10[1])spoken (10[1])dialect to use (10[1])“vos” in place of “tú” originated along this river in neighborhoods (10[1])like Palermo. The Superclásico (10[2])is played between a team named for this body of water and Boca Juniors. For (10[1])10 points, the tango developed in dancehalls along what river whose estuary borders Montevideo and Buenos Aires? ■END■ (10[1])