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Pilcomayo River
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The Pilcomayo River is a major waterway in South America, serving as a natural border between Paraguay and Argentina. Originating in the Bolivian Andes at an altitude of over 3,900 meters, it travels approximately 2,500 kilometers before emptying into the Paraguay River. The river is notorious for its high sediment load, which has historically caused frequent course changes and silting in the flatlands of the Gran Chaco. This hydrological instability poses significant challenges for water management and border demarcation, requiring ongoing cooperation between the bordering nations. Ecologically, the Pilcomayo basin is vital for the arid Chaco region, sustaining vast wetlands such as the Bañados la Estrella. It serves as a lifeline for numerous indigenous groups, including the Wichí and Toba, who have depended on its fish stocks for centuries. Despite increasing environmental pressures from upstream mining activities, the Pilcomayo remains one of the most critical river systems for biodiversity in the heart of the continent.
- Location: Paraguay
- Nearby: Lambaré (8 km)
Best time to visit & climate
The most pleasant time to visit is Jun, Aug, Sep.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | 28 | 28 | 27 | 23 | 19 | 17 | 16 | 18 | 21 | 24 | 25 | 27 |
| Rain mm | 126 | 139 | 136 | 149 | 143 | 74 | 63 | 38 | 73 | 163 | 191 | 179 |
📋 Practical info
Getting there
Reaching this remote river safely usually involves navigating exceptionally rugged dirt roads through the wild Gran Chaco region, fundamentally requiring a highly reliable four-wheel-drive vehicle.
Best season
The dry winter season is highly recommended for any visit, as intense summer rains frequently cause significant unpredictable flooding, making many vital access paths completely impassable.
Terrain & paths
The fascinating surrounding landscape is deeply characterized by vast arid plains, dense thorny scrubland, and muddy riverbanks that constantly shift and change with the seasonal water flow.
What to bring
Intrepid visitors must bring ample reserves of drinking water, durable high-ankle hiking boots, robust insect repellent, and extremely lightweight but protective clothing against the thorny brush.
Parking
There are rarely any formal parking lots in this wilderness; vehicles are typically left safely at nearby isolated local settlements, private ranches, or designated makeshift stops along the primary dirt tracks.
Safety
The extreme remote nature of the region means that modern medical facilities are very far away; travelers must be totally self-sufficient and highly cautious of local wildlife, including venomous snakes.
Time needed
Due to the remarkably remote location and difficult access, visits are almost always part of a dedicated full-day or multi-day rugged expedition exploring the broader ecological diversity of the Gran Chaco.
Geography
Facts
- Total length is approximately 2,500 kilometers
- Originates in the Bolivian Andes above 3,900m
- Forms the natural border between Paraguay and Argentina
- One of the rivers with the highest sediment load
- The Sábalo is the most economically important fish
- Joins the Paraguay River near the capital, Asunción
Explore nearby
Notable places around
Route planner — Car & Motorhome
Where do you start? We build the route here, with stops and country notes along the way.
Vehicle
Only stops with (optional):
© OpenStreetMap contributors · OpenRouteService
Sights nearby
Frequently asked questions
Is the Río Pilcomayo navigable?
Due to fluctuating water levels, it is barely passable for large ships.
What animals live along the Río Pilcomayo?
Caimans, capybaras, and many different fish species live here.
Is the water suitable for fishing?
Yes, fishing is popular in many sections, but observe local regulations.
What is the climate like in the region?
There is a subtropical climate with very hot summers and mild winters.
Is it easy to access the riverbank?
Access is partly difficult, as large parts of the banks are untouched nature.
Pilcomayo River: where is it located?
Pilcomayo River is located in Paraguay.
Pilcomayo River: when is the best time to visit?
The most pleasant time to visit is Jun, Aug, Sep.
Pilcomayo River: why is it worth visiting?
The Pilcomayo River is a major waterway in South America, serving as a natural border between Paraguay and Argentina.
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History & landmarks
Nature
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A calm river in the Gran Chaco that provides an important water source for local wildlife.
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A rugged hill area in the south of Paraguarí, rich in granite formations.