A visit to Colonia del Sacramento is one of the easiest and most popular day trips you can take from Buenos Aires. Cheekily referred to by porteños as the city's 49th barrio, Colonia actually belongs to Uruguay. We recently took the slow ferry across the river to check out this beautifully upheld colonial village.
South America's second-longest river, the Paraná, begins in Brazil and flows south, etching out the border between Paraguay and Argentina. Before emptying into the Rio de la Plata, the river extends into a flood plain which reaches 200 miles in length and nearly 40 miles in width. The city of Tigre, with a population of 30,000, is found near the delta's end.