Bañado La Estrella: The Formosa Wetland Few Travelers Know

Bañado La Estrella is one of the largest and most important wetlands in Argentina. This guide explains what it is, what wildlife it shelters, when to visit and how to get there.

What is Bañado La Estrella

Bañado La Estrella is a wetland system located in the center-west of Formosa Province in northern Argentina. It covers approximately 400,000 hectares — larger than the province of Tucumán — and is one of the most important wetland ecosystems in South America.

The wetland originates from the Pilcomayo River, which descends from Bolivia and Paraguay and spreads across the Formosa Chaco plain creating a mosaic of lagoons, marshes, channels and aquatic vegetation of extraordinary diversity. The name "La Estrella" (The Star) comes from the shape the system takes when seen from the air: water disperses in multiple arms radiating from the center like the rays of a star.

Unlike other well-known Argentine wetlands — the Iberá in Corrientes, the Paraná Delta — Bañado La Estrella has no mass tourism infrastructure and no crowded access. It is a destination that requires planning and logistics, which makes it one of the most authentic and preserved corners of northern Argentina.

What wildlife lives in Bañado La Estrella

The abundance and diversity of wildlife is the main reason to visit Bañado La Estrella. The wetland system functions as a refuge and breeding area for extraordinary fauna.

Birds — it is the richest bird ecosystem in northern Argentina. The most emblematic species include:

• Chilean flamingo and Austral flamingo: in groups of hundreds or thousands of individuals, especially in the most open lagoons.
• Jabiru stork: the largest stork in the Americas, nesting in the wetland's trees.
• Roseate spoonbill: one of the most photogenic birds of the wetland.
• Cocoi heron, great egret and cattle egret: in very high densities along all water bodies.
• Red-legged seriema: endemic to the Chaco, frequent along the wetland's edges.
• Southern screamer, rosy-billed pochard, yellow-billed pintail: various duck and waterfowl species in the internal lagoons.
• More than 350 bird species recorded in the system.

Mammals — the wetland shelters capybaras, neotropical river otters, coatis, grey foxes and, more rarely, maned wolf and tapir.

Reptiles — yacaré caimans in very high densities across all water bodies. Bañado La Estrella has one of the most important caiman populations in Argentina.

When is the best time to visit

August and September are the best months. Water is at its lowest level, wildlife concentrates in the main lagoons and sighting opportunities are at their peak. Flamingos gather in extraordinary numbers, caimans line every shoreline and waterbirds are at full activity. Temperatures are comfortable — between 20°C and 28°C during the day — and road conditions are at their best.

General dry season (June–October) — the entire dry season is suitable for visiting, but the real peak of concentrated wildlife is August and September. As October progresses, heat increases and early rains begin to disperse the fauna.

Wet season (November–April) — the wetland expands and many access routes become impassable. Wildlife disperses and sightings are less predictable. Visiting is not impossible but requires more complex logistics and higher-clearance vehicles.

For bird photography, the sunrise and sunset outings in August and September — when light is lateral and golden — produce the best images.

Where it is and how to get there

The main access to Bañado La Estrella is from Las Lomitas, a town located 360 km west of Formosa city along National Route 81. From Buenos Aires, the most practical option is to fly to Formosa (2-hour direct flight) and then travel by vehicle or join an organized excursion to Las Lomitas.

There are two main access points to the wetland:

El Vertedero — located 45 km from Las Lomitas, this is the easiest access point to Bañado La Estrella, where Provincial Route 28 crosses the wetland. It is a water management structure that regulates flow through a system of floodgates. From here, visitors can take canoe trips led by local guides. It is an outstanding site for birdwatching and fishing, with waterbirds visible in large numbers directly from the road.

Fortín La Soledad — a historic fort from the Chaco War era, now operating as a base for deeper excursions into the wetland. Sunrise and sunset outings are organized from here for wildlife observation in the internal lagoons, where flamingo and waterbird concentrations are highest.

It is also possible to reach Las Lomitas from Resistencia by private vehicle along Route 81 — approximately 5 hours from Resistencia.

Bañado La Estrella as an extension of El Impenetrable

One of the most rewarding combinations for travelers visiting northern Argentina is linking El Impenetrable National Park in Chaco with Bañado La Estrella in Formosa. Both ecosystems are a few hours apart and are complementary: the dense Chaco woodland of El Impenetrable contrasts with the vast open expanse of the wetland. The birds, mammals and landscapes are completely different.

Centinela Explora offers Bañado La Estrella as an optional extension of its El Impenetrable departures. Access is made by crossing the Bermejo River from Camping La Fidelidad and continuing by vehicle to Fortín La Soledad — a journey that is itself part of the experience.