Composing part of the border between Argentina and Uruguay, this 180-mile-long estuary is formed by the confluence of the Uruguay River and the Paraná River. Though used for centuries by native tribes, the river wasn’t explored by Europeans until the 16th-century Spanish navigator Juan Díaz de Solís went in search of a passage between the Atlantic and the Pacific Oceans. He originally named this enclosed coastal body, about one mile across at its widest point, the Mar Dulce, or freshwater sea; after multiple explorations by various other Spanish navigators, the waterway came to be known as the Rio de la Plata, or River of Silver, for the promise of riches thought to lie upstream.

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Buenos Aires Bike Tour: San Telmo and La Boca Districts

4.5 star rating: Recommended 40 Reviews

Explore Buenos Aires’ well-known neighborhoods in and around the city center and the Rio de la Plata on a fun-filled bike tour. With a knowledgeable guide, ...  Read more

Location: Buenos Aires, Argentina
Duration: 4 hours (approx.)

From USD $48.39
$89.99 Save $41.60

Day Trip to Colonia from Montevideo

4.5 star rating: Recommended 8 Reviews

Get to know the city of Colonia del Sacramento on a day trip from Montevideo! Discover the colonial charm and history of this coastal city as you explore the ...  Read more

Location: Montevideo, Uruguay
Duration: 8 hours (approx.)

From USD $82.99

Tigre Delta Day Trip from Buenos Aires

4 star rating: Recommended 170 Reviews

Replace the bustle of Buenos Aires with the green countryside of the Tigre Delta! A popular weekend getaway for Buenos Aires locals, the delta offers lush ...  Read more

Location: Buenos Aires, Argentina
Duration: 4 or 8 hours

From USD $51.69

Buenos Aires Running Tour

1-2 hour guided running tours through the streets and parks of Buenos Aires taking you past landmarks, main attractions, beautiful nature views and other ...  Read more

Location: Buenos Aires, Argentina
Duration: 2 hours (approx.)

From USD $55.00

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