350 hectares of wetlands on the Rio de la Plata, created accidentally when landfill for a never-built highway became overgrown in the 1980s. Now a protected ecological reserve with walking trails, lagoons, birdwatching, and skyline views. Nature in the middle of a 13-million-person metro area.
Location
Puerto Madero, Buenos Aires
Map
Insider Intel
Enter at the northern or southern access points. Walk the main circuit (5.5km, flat, well-marked). The lagoons attract hundreds of bird species — bring binoculars if you care. The boardwalk sections offer river views and city skyline in the distance. Rent a bike if you want to cover more ground.
Early morning for birdwatching and cooler temperatures. Weekdays are quieter. Weekends see porteño families, joggers, and cyclists. Open Tuesday–Sunday, 8am–6pm (7pm in summer). Closed Mondays.
The reserve exists because urban planning failed — the 1970s landfill project for a new coastal district collapsed, and nature reclaimed it. By the 1980s, grassroots activism turned it into a protected reserve. Over 300 bird species have been recorded, including herons, ducks, and occasional flamingos. Free entry. No food vendors inside, bring water. The contrast between the reserve and the Puerto Madero skyscrapers next door is striking. A rare example of urban nature working.