🇦🇷 Argentina · The Northeast
Bañado La Estrella is one of the most extraordinary and least known wetlands in Argentina: an immense mirror of water and vegetation in central-western Formosa, formed by the overflows of the capricious Pilcomayo River. Its most famous image is the 'champales', trees left covered by water and climbing plants, turned into ghostly shapes that rise from the wetland like natural sculptures of surreal beauty.
This vast wetland, which some consider the third largest in the country, is a paradise of biodiversity: caimans, capybaras, monkeys, water birds in great numbers and abundant Chaco wildlife find refuge in its waters and woods. Touring it by boat, gliding between the ghost trees and the floating vegetation, is one of the most striking and singular nature experiences in northeastern Argentina.
This guide covers the essentials of Bañado La Estrella with a practical eye: what this unique wetland is and how it formed, its landscapes of champales and ghost trees, the wildlife you can see, the boat trips and photo safaris, and how to get there and get around this hidden gem of the Formosa Chaco.
Bañado La Estrella is a relatively recent, constantly changing wetland, created by the overflows and course changes of the Pilcomayo River, which drags enormous quantities of sediment down from the Andes and spills its waters across the Formosa plain. That dynamic gradually flooded the woodland and formed the characteristic 'champales' or ghost trees. The region was and still is inhabited by Indigenous peoples of the Chaco (Wichí, Pilagá) and by criollos who raise cattle. In recent decades the wetland has gained recognition as a tourist attraction and as an area of great natural value, with provincial protection status. The full story is on our history page.
Read the full history ↓The province of the far north, between the Pilcomayo and the Bermejo: Qom, Wichí and Pilagá land, defined by the Hayes Award of 1878, marked by the Rincón Bomba Massacre of 1947, of marshes, palm groves and the Bañado La Estrella, one of the last natural frontiers in the country.
Read the history of Formosa →No exact prices: a scale from $ (budget) to $$$$$ (luxury), with 2-3 options per category.
Origins, formation and what the sources say.
Bañado La Estrella is, above all, the work of the Pilcomayo River. This river, which rises in the Bolivian Andes and drops toward the Chaco plain, is famous for its enormous sediment load: it drags down huge quantities of mud and sand that it deposits as it loses gradient on entering the flatland. That material ends up clogging its own channel, forcing the river to overflow and look for new paths.
In the center-west of Formosa province, those overflows of the Pilcomayo created, over time, a vast wetland of open water, marshes and flooded woodland: Bañado La Estrella. Unlike older, more stable wetlands, La Estrella is a dynamic and relatively young environment, in permanent transformation, whose appearance changes with the floods and the river's changes of course.
One of the most striking effects of this dynamic was the flooding of entire stands of woodland: left under water, many trees died, and over their skeletons a growth of climbing plants and epiphytes developed that covered them completely. That's how the 'champales' were born, the famous ghost trees that give the wetland its surreal, unmistakable look, one of the most singular natural images in Argentina.
The region of Bañado La Estrella and the center-west of Formosa has been inhabited since very ancient times by Indigenous peoples of the Gran Chaco, such as the Pilagá, the Wichí and other groups, deeply adapted to an environment of woodland, rivers and marshes. For them, the wetland and its surroundings were a source of fishing, hunting, gathering and all kinds of resources, part of a territory they knew in detail.
Over time criollo populations joined them, devoted above all to extensive cattle raising, a traditional activity across the whole Chaco plain. Life around the wetland was organized around the water, the woodland and the river's cycles: floods and droughts set the rhythm of ranching, fishing and movement.
This coexistence of cultures — Indigenous and criollo — is part of the region's identity. Local knowledge of how the Pilcomayo behaves, of the routes through the wetland and of its wildlife is still valuable, and today many residents work as guides and operators in the fledgling nature tourism that has begun to develop around this extraordinary wetland.
The access points to the wetland still carry the mark of frontier history in their names. 'Fortín La Soledad', the main tourist access, refers to the network of military outposts the Argentine state built across the Gran Chaco between the late 19th and early 20th centuries, during the campaigns to occupy a territory that until then was under the control of Indigenous peoples.
The Chaco was one of the last regions fully incorporated into the country. Unlike Patagonia, its extreme climate, its impenetrable woodland and the resistance of its original inhabitants slowed the criollo advance. The fortines — small forward garrisons — marked the frontier line and served as bases for the military expeditions that, over several decades, subdued the Indigenous communities and opened the territory to settlement, ranching and the logging of quebracho.
Formosa was created as a National Territory in 1879 and only became a province in 1955. That history of a late frontier explains why the wetland region remained, for so long, a remote and sparsely populated corner. Today, those old forts and settlements are the thresholds from which visitors get their first look at one of the most astonishing wetlands in the country.
For a long time, Bañado La Estrella was a corner all but ignored by tourism, known above all to local residents and to a few travelers and naturalists. Its remoteness, the region's extreme climate and the lack of infrastructure kept it off Argentina's major tourist circuits.
In recent decades, however, the wetland has gained recognition as one of the most singular and photogenic in the country. The spread of images of its champales and ghost trees, along with growing interest in nature tourism and birdwatching, led the province of Formosa to promote it as one of its main attractions, alongside Río Pilcomayo National Park.
Alongside the tourism development, awareness grew of the value of conserving this environment: its biodiversity, its role in the water cycle and its unique beauty make it natural heritage of the first order. Provincial protection status has been advanced, along with management that seeks to reconcile tourism with care for the wetland and respect for the local communities. Today Bañado La Estrella offers itself to visitors as a hidden gem of the Formosa Chaco, a place where nature, shaped by the capricious Pilcomayo, stages one of its most astonishing spectacles.
A few kilometers from Bañado La Estrella, downstream on the same Pilcomayo River, lies Río Pilcomayo National Park, another key piece for understanding the natural history of this Chaco region. It was created by Law 14,073, passed on 29 September 1951 and enacted a month later, with the aim of protecting a representative sample of the humid Chaco of Formosa: its marshes, caranday palm groves, gallery forests and a biodiversity comparable in many ways to that of the wetland itself.
In its early days, the park covered some 285,000 hectares, an enormous area for the time. In 1968, however, at the request of the Formosa Legislature, a new law cut its extent to a little under 52,000 hectares, transferring the rest of the territory to provincial jurisdiction. Later, in 1990, a national decree designated a sector of the park as a strict nature reserve, reinforcing its protection. Located near the towns of Laguna Blanca and Laguna Naick Neck, the park has now been going for more than seventy years, establishing itself as one of the great biodiversity reservoirs of northeastern Argentina.
Although administratively they are separate areas — the park comes under the National Parks Administration and the wetland is managed by the province — both share the same basin, the same wildlife and much of their history: that of the Pilcomayo overflowing across the Chaco plain and creating, as it goes, a mosaic of wetlands that today rank among the richest and least altered environments in all of Argentina. For travelers who make it to Las Lomitas or Fortín La Soledad, knowing this history helps put into perspective what they're looking at: not an isolated landscape, but part of a much wider natural system, forged over centuries by a river as capricious as it is generous.