Location: 224 mi (360 km) North of Resistancia, Formosa Province Map
Area: 47,754 ha (118,000 acres)
Info: Ave Pueyrredón & RN 86, Laguna Blanca
Tel. (03718) 470 045
Open: daily
Río Pilcomayo National Park is located 224 mi (360 km) North of
Resistancia, Formosa Province in Argentina. Río Pilcomayo National
Park covers an area of 47,754 ha (118,000 acres). Río Pilcomayo
National Park was found on September 29, 1951 to protect river
Pulcomayo and surrounding marshes, creeks, lakes, rain forests and
plains. It is situated in the North East part of Formosa Province of
Argentina on the border with Paraguay. Río Pilcomayo National Park
climate is subtropical. It recieves 1200 mm (47 in) of rain
annually, although most of percipitations falls during the wet
months of the ear. During summer months (December through February)
temperatues can reach 104 degrees F, while in winter (June- August)
temperatures can plummet to 30's degrees.
Keep in mind that
much of Río Pilcomayo National Park is covered by wetlands, area
inhabited by many dangerous animals. Treat any body of water with
caution. Some of these animals include two caiman crocodile species,
including the yacare caiman and the broad snouted caiman.
Additionally protected bio reserve is inhabited by several species
of constricting snakes that includes the yellow anaconda (Eunectes
notaeus) and Hydrodynastes gigas.
Best Time to Visit
The park can be visited any
time, but the best period is April to October. Winter (June–August) is
ideal for hiking and birdwatching because temperatures are milder and
conditions are drier. Summer (November–March) brings extreme heat (often
exceeding 40 °C) and heavy rains that can make dirt access roads
impassable for days. Always check the weather and road status beforehand
via the National Meteorological Service and park contacts. Annual
rainfall is about 1,200 mm, concentrated in the warmer months; mean
temperature is around 23 °C.
Getting There
By car from Formosa
city: Roughly 130–175 km depending on the route (via RN 11 to Clorinda
then RN 86, or RP 2). Portal Estero Poí is about 6 km from Laguna
Blanca; Portal Laguna Blanca is roughly 10 km from Laguna Naineck on a
gravel road.
From Asunción, Paraguay: Cross the San Ignacio de Loyola
bridge, then take RN 86 from Clorinda (about 45–60 km to the portals).
Public transport: Buses reach Formosa or Clorinda; companies such as
Godoy, Norte Bis, and Flecha Bus connect to Laguna Blanca or Laguna
Naineck. From the towns, take a taxi, remis, or bike the final short
distance. Buses do not enter the park itself.
Airports: Formosa’s El
Pucú (FMA) or Asunción’s Silvio Pettirossi (ASU).
Fuel is
available in Laguna Blanca and Laguna Naineck. Always confirm road
conditions after rain—the Estero Poí access can become impassable, and
Laguna Blanca access can have rough sections.
The Two Main Areas
Estero Poí offers a more wild experience of the characteristic palm
savannas, termite mounds, and monte islets. It has an information
office, a small self-guided trail, camping, and the start of the 16 km
Lata Cue vehicle/bike trail that reaches a viewpoint (mangrullo) on the
Pilcomayo River. There is also a bird observatory at Estero Pirity
(covered structure reached by a short boardwalk and stairs) and trails
such as Karaguatá Guatahá that lead to a lookout over Estero Catalina.
Laguna Blanca centers on a 700-hectare lagoon of scenic and cultural
importance to the Qom people. Boardwalks (including a roughly 560 m
low-difficulty section) allow easy access for viewing yacarés (caimans),
capybaras, and aquatic birds, plus excellent sunsets. There is a visitor
center, interpretive trails, a native plant nursery, and camping.
Non-motorized boats (kayaks, canoes, or larger rabaska-style canoes) are
allowed if previously disinfected (to prevent invasive species such as
the golden mussel) and registered with rangers.
Activities
Birdwatching: One of the top draws, with 324–332 recorded species,
including threatened or restricted-range birds such as the greater rhea,
black-winged nightjar, black woodpecker, and strange-tailed tyrant, plus
many waterbirds (storks, herons, jabiru, etc.). Bring binoculars and a
field guide. The Estero Pirity observatory is especially useful.
Hiking: Multiple low-difficulty, interpretive, mostly
accessible-with-assistance trails (Los Secretos del Monte, Hormiguero
Gigante, Karaguatá Guatahá, Laguna Blanca boardwalks). Stay on marked
paths.
Vehicle or bicycle circuit: The 16 km Lata Cue trail through
palm savannas and monte islets to the river viewpoint (also bikeable).
Drive slowly and only on designated routes.
Non-motorized boating: On
Laguna Blanca (registration and disinfection required). Local providers
sometimes offer kayak, canoe, or rabaska outings.
Camping and day
use: Free camping zones at both portals with fire pits/parrillas,
tables, toilets (including accessible ones), showers (hot water in
some), electricity, lighting, and Wi-Fi in the service areas. Park water
is treated but not potable—bring your own drinking water. Day-use hours
follow daylight (roughly 8–18 h in winter season May 1–Sep 21; 7–19 h in
the rest of the year); camping areas remain accessible 24 hours, but
notify staff if entering/exiting outside regular hours.
Wildlife
and Nature Highlights
Expect a mosaic of habitats supporting high
biodiversity: roughly 85 mammal species, 42 reptiles, 32+ amphibians,
40+ fish, and the large bird list. Notable mammals include giant
anteater, maned wolf (aguará guazú), tapir, howler monkeys, Azara’s
night monkey (mirikiná—unique in Argentine parks), capybaras, collared
and white-lipped peccaries, ocelot, puma, and river otter. Reptiles
feature two species of yacaré and the yellow anaconda (boa curiyú).
There have been jaguar (yaguareté) records, including camera-trap
photos. Do not feed fish—piranhas are present.
Characteristic flora
includes caranday palms (Copernicia alba) dominating the savannas,
hard-wood trees (lapacho, quebracho colorado chaqueño, algarrobo,
guayacán) in the monte islets, and floating/emergent wetland plants such
as camalotes, pirí, and huajó.
Essential Practical Tips
Water:
Carry at least 2 liters per person per day. Park water is not for
drinking.
Insects and sun: Mosquitoes and other insects are
abundant—bring strong, long-lasting repellent. Use sunscreen, a hat,
light-colored lightweight clothing (long sleeves/pants recommended), and
sunglasses. Light non-slip footwear is useful on potentially muddy or
slippery ground.
Other gear: Food and snacks, trash bags (pack out
what you pack in), basic first-aid kit, binoculars/camera, and extra
fuel. A bird guide enhances the experience. Check your vehicle before
leaving town.
Registration and rangers: Register on arrival and
consult park rangers. They provide current trail and access information.
Rules: No hunting, fishing, plant collecting, or disturbing wildlife.
Stay on marked trails and roads. Fire only in designated spots (clear
vegetation around the fire and fully extinguish with water). No pets.
Drive slowly. Do not litter (glass, plastic, or cans can start fires).
Road and weather caution: After heavy rain, accesses can close or become
difficult for up to 72 hours. Contact the park in advance.
Duration:
One full day is feasible for the main highlights; two days allow more
thorough exploration of both portals and trails.
Accommodation
and Nearby Services
Free camping is available inside both
recreational areas (register in advance for safety). In Laguna Blanca
there are modest hotels (examples include Hotel Guaraní, Hotel Brimalú,
and Hotel Imperial). Simple lodging and basic services (shops, fuel)
exist in both Laguna Blanca and Laguna Naineck. Laguna Blanca hosts the
National Pomelo Festival. Farther afield is the large Bañado La Estrella
wetland system (excellent for birds) and Formosa Natural Reserve.
Contacts
Email: riopilcomayo@apn.gob.ar
Phone: +54 3718 470045
Official site: argentina.gob.ar (search Parque Nacional Río Pilcomayo) —
also check Facebook and Instagram for updates
Intendencia is near
Laguna Blanca (Pueyrredón and RN 86)
Topography and Geology
The park occupies a vast, gently sloping
plain with minimal elevation variation (generally sloping slightly from
west to east). Subtle differences in height of just a few meters create
major environmental contrasts, especially during floods.
Geologically, it is a sedimentary basin formed when a depression in
Paleozoic crystalline rocks filled with organic and inorganic sediments.
The uppermost layers are of fluvial and aeolian origin. Eastern soils
tend toward silts and clays (less permeable), while western soils are
coarser and more porous. Faults linked to Andean uplift run roughly
parallel to the Paraguay River.
Hydrography and Wetland Character
The Pilcomayo River (Río Pilcomayo) forms the park’s northern boundary
and is its defining watercourse. This major river (about 1,590 km long,
originating in the Bolivian Andes and eventually joining the Paraguay
River) carries heavy sediment loads and drives the region’s hydrology.
In its lower course it is highly dynamic, with shifting channels,
overflow, and seasonal flooding.
During the wet season the river and
local rainfall inundate low areas, creating interconnected temporary
lakes, channels, esteros (marshes), bañados (seasonally flooded
grasslands), and permanent freshwater marshes. These alternate with
drier periods, producing strong wet-dry cycles that shape the entire
landscape. Most surface water bodies are temporary, but the southern
part of the park holds the larger, more permanent Laguna Blanca
(~700–800 ha), a key habitat for waterbirds, caimans, and other
wildlife.
The overall wetland complex consists of rivers, lagoons,
permanent and seasonal marshes, and flooded grasslands interspersed with
gallery (riparian) forests. This mosaic is what earned the site Ramsar
status.
Climate
The climate is subtropical humid (sometimes
described as tropical humid with a marked winter decrease in rainfall
rather than a true dry season). Mean annual temperature is about 23 °C
and mean annual precipitation is roughly 1,200 mm, with peaks typically
in March and November and lower totals in winter. Summers are hot, with
maxima frequently exceeding 40 °C (and occasionally higher); winters are
mild but can bring occasional frosts. The region also experiences
frequent tornadoes.
Landscape Mosaic and Vegetation Zones
Small elevation differences produce four main environmental types:
Savannas / palm savannas — Extensive grasslands dotted with caranday
(white palm / Copernicia alba) palms (up to ~14 m tall with glaucous
green fan leaves). These dominate much of the park and support termite
mounds, maned wolves, rheas, and other grassland species.
Wetlands —
Low-lying bañados, esteros, and lagoons with aquatic and floating
vegetation (water hyacinths and others). Laguna Blanca is the standout
permanent water body.
Isletas de monte (forest islands) — Patches of
denser woodland on slightly higher ground, featuring quebrachos
(Schinopsis balansae and Aspidosperma quebracho-blanco), lapachos,
algarrobos, and other Chaco trees.
Selva de ribera / gallery forests
— Narrow belts of riparian forest along the Pilcomayo and its former
channels, with figs, other trees, lianas, vines, and epiphytes, subject
to periodic extraordinary floods.
Most of the park’s surface is
covered by grasslands and caranday palm groves, with wetlands in the
depressions and forest islands on the higher points. This water-driven
mosaic is characteristic of the Humid Chaco.