Qualla: Costanera Sur Ecological Reserve

Costanera Sur Ecological Reserve: Introduction

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Rcidte, Public domain. Nobody designed this place. In the 1970s and early 1980s, trucks rumbled to the edge of the Rio de la Plata and dumped load after load of demolition rubble into the shallows beside downtown Buenos Aires. The plan was to reclaim the riverbed as a platform for a sprawling new municipal administrative center. The center was never built. The rubble simply sat there, and the river answered in its own way: seeds drifted in, water pooled into lagoons, reeds and grasses took root, and birds arrived in their thousands. What was meant to be a parking lot for bureaucracy became, by accident, the largest and wildest green space in the city.

Image: Rcidte | Public domain

Costanera Sur Ecological Reserve: When the City Came to Swim

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Banfield, CC BY-SA 2.5 ar. Long before the rubble, this stretch of shore was where Buenos Aires came to play. The Municipal Riverside resort opened in 1918, and for decades the Costanera Sur promenade was the place to be. On foot, by car and by tram, thousands of porteños arrived on summer afternoons to ta...

Image: Banfield | CC BY-SA 2.5 ar

Costanera Sur Ecological Reserve: The Return of the Wild

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Luis Argerich from Buenos Aires, Argentina, CC BY 2.0. Into that abandoned, rubble-strewn margin, nature poured. Pampas grass spread across the new ground in silvery plumes. Forests of alder rose where there had been construction debris. Three lagoons formed and filled, and around them gathered an astonishing abundance of life. More ...

Image: Luis Argerich from Buenos Aires, Argentina | CC BY 2.0

Costanera Sur Ecological Reserve: A Wetland of Global Importance

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit CC BY-SA 2.0. What began as an accident is now protected as a treasure. The reserve covers roughly 350 hectares of lagoons, grassland and woodland, and in 2005 it was designated a Ramsar site, a wetland of international importance, recognized alongside the great marshes and estuaries of the wo...

Image: CC BY-SA 2.0

Costanera Sur Ecological Reserve: An Escape Inside the Metropolis

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Liam Quinn from Canada, CC BY-SA 2.0. For the people of Buenos Aires, the reserve is a lung and an escape hatch. Winding paths lead down to the brown expanse of the Rio de la Plata, perfect for walking, cycling and birdwatching, and on weekends families spread out for picnics near the water. It is the rare place wher...

Image: Liam Quinn from Canada | CC BY-SA 2.0