Iberá

Iberá National Park protects a portion of Argentina's most extensive wetland system in the northeastern province of Corrientes. Established on December 5, 2018, through Law No. 27.481/18, this national park encompasses approximately 195,094 hectares (around 1,951 km²) of marshes, floating islands, lagoons, and gallery forests within the Iberá wetlands. ^[1] The landscape features unique ecosystems shaped by seasonal flooding, with floating vegetation mats supporting diverse plant communities. These wetlands harbor exceptional wildlife including capybaras, caimans, marsh deer, and over 360 bird species. The park serves as the centerpiece of an ambitious rewilding program reintroducing locally extinct species including giant anteaters, jaguars, and giant otters. The park sits within the larger Iberá Provincial Reserve (created 1983, 1.3 million ha), which forms the broader conservation framework. This remarkable wetland complex represents one of South America's most significant recent conservation achievements.

Iberá hosts an extraordinary diversity of wildlife, with over 360 bird species making it a premier birdwatching destination. ^[1] Notable species include the jabiru stork, southern screamer, and various herons and ibises. The wetlands are home to significant populations of yacaré caiman, capybara (the world's largest rodent), and marsh deer. Through successful rewilding efforts, previously locally extinct species have been reintroduced, including giant anteaters, pampas deer, and collared peccaries. The park supports healthy populations of howler monkeys and numerous fish species. Jaguars were successfully reintroduced as part of the broader Iberá rewilding initiative, restoring the apex predator to a landscape from which it had been absent.

The park's vegetation is diverse, featuring plant communities adapted to the wetland environment. Floating meadows of water hyacinths, water lilies, and aquatic grasses create intricate patterns across the water's surface. The embalsados (floating islands) support a unique ecosystem of vegetation, including tall grasses, rushes, and even shrubs and small trees. Along higher ground, gallery forests contain characteristic species like lapacho, timbó, and ceibo trees, while palm savannas featuring the caranday palm (Copernicia alba) create distinctive landscapes throughout the park. The mix of aquatic, savanna, and forest communities supports the exceptional biodiversity for which the Iberá system is renowned.

The Iberá Wetlands formed when the Paraná River shifted course, creating a vast depression that filled with water and became one of the world's great freshwater systems. ^[1] The landscape consists of a complex mosaic of marshes, floating islands (embalsados), grasslands, and forests sitting atop ancient river beds and Quaternary alluvial deposits. The wetlands are primarily fed by rainwater rather than rivers, creating a unique hydrological system. The soil is predominantly sandy and acidic, with some areas featuring rich organic matter from decomposed aquatic vegetation. Sandy ridges—remnant riverbanks from when the Paraná occupied this depression—rise above the marshes and support terrestrial vegetation communities distinct from the surrounding wetlands.

Iberá National Park experiences a subtropical climate with hot, humid summers and mild winters. Average temperatures range from around 15°C in winter to 32°C in summer. The region receives substantial rainfall throughout the year, with annual precipitation averaging around 1,500 mm. The wettest months are typically March to May and October to December. Visitors should be prepared for sudden weather changes and afternoon thunderstorms, particularly in summer. High humidity levels are common year-round, making spring (September–November) and fall (March–May) the most comfortable seasons for visiting.

The Iberá Wetlands have been home to indigenous Guaraní people for thousands of years, with their name Iberá meaning bright waters in the Guaraní language. The area remained largely remote until the 20th century when cattle ranching expanded into the wetlands. In 1983, the Corrientes provincial government created the Iberá Provincial Reserve under Law 3771, establishing protection for the broader wetland system. In 2018, Iberá National Park was officially designated through the efforts of Conservation Land Trust (now Rewilding Argentina), which transformed former cattle ranches into protected areas and donated them to the Argentine federal government, making it one of the largest private conservation donations in South American history.

The Iberá wetlands remained relatively intact through much of the 20th century due to their remoteness and challenging terrain. However, hunting and habitat alteration led to local extinctions of several large mammal species. The Iberá Provincial Reserve had been protecting the broader wetland complex since 1983. In the late 1990s, conservation philanthropists Doug and Kris Tompkins began purchasing former cattle ranches adjacent to the provincial reserve through Conservation Land Trust Argentina. Following Doug Tompkins' death in 2015, the foundation donated over 150,000 hectares to the Argentine federal government, enabling the creation of Iberá National Park in 2018 under Law 27.481. ^[1] This donation, combined with provincial lands, created one of Argentina's most important protected wetland systems. The park's establishment launched one of Latin America's most ambitious rewilding initiatives, with systematic programs to reintroduce species that had disappeared from the region.

The park features four entry portals—Cambyretá, San Nicolás, Carambola, and Laguna Iberá—each offering distinct wetland experiences. ^[1] Laguna Iberá, accessible from Colonia Carlos Pellegrini, is the most visited sector and offers excellent boat tours and wildlife viewing. The Carambola portal provides elevated viewpoints over the wetlands. The park's extensive network of waterways allows for kayaking and boat tours, while elevated walkways in some areas provide access to otherwise inaccessible wetland habitats. The park is also known for its spectacular sunrises and sunsets over the wetlands. Wildlife viewing focuses on reintroduced species and the abundant wetland birds that make Iberá famous among birdwatchers.

The park maintains visitor centers at key portals including Cambyretá and San Nicolás, offering information on wetland ecology and rewilding programs. Boat tours provide the primary way to explore the wetlands, with local guides navigating channels and lagoons. Horseback riding with gaucho guides offers authentic cultural experiences. The park features lodges and campsites in the nearby towns, including facilities operated by local communities. The most accessible entry point is via Colonia Carlos Pellegrini, reached by 120 km of unpaved road from Mercedes. Spring and summer offer optimal conditions for wildlife observation. The park actively promotes community-based tourism, with local residents trained as guides and lodge operators.

Conservation management centers on the comprehensive rewilding program systematically reintroducing locally extinct species. Teams prepare animals through pre-release conditioning, then monitor their adaptation and breeding success. Jaguar reintroduction represents the program's apex achievement, with breeding populations now established. Giant anteater and giant otter programs have successfully released animals reproducing in the wild. ^[1] The park maintains extensive camera trap networks monitoring wildlife populations and movements. Habitat restoration addresses areas degraded by livestock grazing, with native vegetation recovering as cattle are removed. The park works closely with surrounding communities to prevent human-wildlife conflict as predators return to the landscape. In early 2022 wildfires burned a significant portion of the park, though rescue operations helped save many reintroduced animals, and the wetland ecosystem has shown recovery capacity.