Covering 350 hectares, the Costanera Sur Ecological Reserve is the biggest and most biodiverse green space in the city of Buenos Aires. Despite its proximity to the busy downtown area, with the skyscrapers of Puerto Madero in plain sight, it's a remarkably tranquil oasis of calm, and a haven for wildlife.
Along several winding paths leading around three lagoons to the Rio de la Plata river, you can observe many different species of birds, mammals, reptiles and amphibians, as well as more than 500 species of native vegetation including meadows of pampas grass, forests of alder trees and many examples of the cockspur coral tree, Argentina's national flower.
The more than 2,000 species of flora and fauna that live in the reserve include lizards, turtles, coypus, and up to 340 species of birds that have been spotted. It is not uncommon to spot at least 50 different species of birds in just a two-hour visit.
You can walk around the park in about an hour, or hire a bike near the entrance.
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