Plizio Visual Lab

Pilcomayo River

Plizio editorial teamUpdated: Jun 2026Data Sources

River

Weather…

The Pilcomayo River is a significant waterway in South America, originating in the Bolivian Andes at an elevation exceeding 3,900 meters. It flows through the Bolivian highlands and the Gran Chaco region before emptying into the Paraguay River, defining part of the border between Argentina and Paraguay. Spanning about 1,100 kilometers, the river is a crucial water source in an otherwise semi-arid landscape. A defining characteristic of the Pilcomayo is its exceptionally high sediment load, which causes frequent changes to its riverbed and significant siltation in the lower reaches. This natural dynamic poses major challenges for water management and for the indigenous communities who have traditionally relied on fishing for survival. The river supports a diverse fish population, with the sábalo being the most economically important species. However, environmental concerns regarding heavy metal pollution from mining activities in the Bolivian highlands have impacted the river's water quality and ecological health over the years.

Best time to visit & climate

The most pleasant time to visit is May–Jul.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg °C	29	28	27	25	22	21	20	23	26	29	30	30
Rain mm	128	149	105	65	27	12	7	3	9	49	76	124

📋 Practical info

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Getting there

Reaching this lengthy river usually entails traveling to towns near the Bolivian-Argentine border or traversing via secondary roads that snake through the semi-arid Gran Chaco region.

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Best season

Visiting during the cooler and drier winter months is generally preferred, as the intense summer heat of the Chaco region can become highly uncomfortable and summer rains can wash out dirt roads.

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Terrain & paths

The surrounding environments transition sharply from high Andean rocky slopes at its origin down to flat, dusty, and often thorny scrublands as it crosses the vast Gran Chaco plains.

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What to bring

A wide-brimmed hat, sturdy walking shoes capable of handling thorns, ample drinking water reserves, and effective dust protection for sensitive camera equipment are generally considered essential.

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Parking

Travelers typically park their durable 4x4 vehicles in designated zones within border settlements or securely near remote local outposts before venturing closer to the riverbanks.

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Safety

Due to the extreme heat, lack of infrastructure, and occasional presence of predatory wildlife or venomous snakes in the bush, visitors should never hike alone and always carry emergency water.

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Time needed

A focused visit to observe the scenery along the accessible parts of the river generally takes a full day, though traveling the rugged regional roads easily turns this into a multi-day journey.