The park was originally the private estate of the Pereyra Iraola family, once spanning 60,000 hectares.
It is home to the 'Árbol de Cristal', a specimen of Agathis alba (Dammar pine) that is a rarity in South America.
The reserve contains one of the last remaining populations of the Tala forest, a unique ecosystem of the Río de la Plata basin.
It is part of the UNESCO Man and the Biosphere Programme, designated in 2008.
The park houses the 'Vivero Isla Victoria', which was historically significant for the introduction of exotic forestry species to Argentina.
Over 200 bird species have been recorded within the reserve boundaries, making it a hotspot for regional ornithology.
The site contains the ruins of the 'Casco de Estancia', reflecting the 19th-century aristocratic lifestyle of the Argentine Pampas.
The soil composition and low-lying geography contribute to its function as a natural flood-mitigation zone for the surrounding districts.
Reserva Ecológica del Parque Pereyra Iraola is a UNESCO-designated Biosphere Reserve situated between the urban hubs of Buenos Aires and La Plata. Spanning over 10,000 hectares, it represents one of the largest green spaces in the metropolitan area. The landscape consists of a mix of native riparian forest, grassland, and exotic tree plantations introduced in the 19th century. It serves as a critical corridor for regional biodiversity, housing over 200 species of birds. The park features remnants of the historical estancia belonging to the Pereyra family, including old casco structures and architectural ruins. Visitors can explore a network of dirt trails suitable for hiking and cycling. It acts as a primary filtration zone for the local watershed and maintains a protected status under provincial law. The area is distinct for its wild, unmanicured vegetation compared to traditional municipal parks.
The historical iron gates at the main entrance and the secluded paths near the Agathis alba specimen.
Bring insect repellent, as the humid, wooded environment supports high mosquito activity year-round.
Carry sufficient drinking water and snacks, as facilities are sparse once you enter the deep forest trails.
Check local weather reports before visiting, as heavy rains can turn the dirt paths into impassable mud.
Do not attempt to traverse deep forest trails after sunset; avoid visiting during or immediately after heavy storms due to flooding risk.
The park may be restricted or closed during extreme weather events; park access often remains open daily but interior sectors may have fluctuating accessibility.
Pack out all trash; stay on marked trails to protect sensitive flora; do not feed wildlife.
