The 900-acre Ecological Reserve was built over a landfill and is home to more than 500 species of bird and a variety of flora and fauna. On weekends thousands of porteños vie for a spot on the grass, so come midweek if you want to birdwatch and sunbathe in peace or use the jogging and cycling tracks. A monthly guided "Walking under the Full Moon" tour begins at 8:30 PM; otherwise avoid the area at night. It's just a short walk across any bridge from Puerto Madero.
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