Buenos Aires Ecological Reserve, Reserva Ecológica de Buenos Aires, also known as Costanera Sur Ecological Reserve, Reserva Ecológica Costanera Sur, is a 865-acre (3.50 km2) tract of low land on the Río de la Plata riverbank located on the east side of the district of Puerto Madero in Buenos Aires CBD, Argentina.
I walked the big loop enjoying most observing the wetlands birds and creatures. My highlight was spotting a Coipo (Myocastor coypus).
If you want to escape the traffic noise of the big city, this is the place to go.
Jogging or cycling that loop would be preferable to walking, in my opinion. It’s ideal for both.