Plizio Visual Lab

Cerro León

Plizio editorial teamUpdated: Jun 2026Data Sources

Mountain

Weather…

Cerro León is an impressive circular geological formation located in the Paraguayan Chaco, within the Defensores del Chaco National Park. Spanning approximately 40 kilometers in diameter, this mountain massif stands as one of the most prominent elevations in the otherwise flat dry savanna landscape. The formation consists primarily of sandstone and reaches a maximum height of around 600 meters above sea level. Ecologically, Cerro León provides a unique habitat for specialized flora and fauna, including various cactus species and endangered mammals like the Chacoan peccary. Geographically, it is situated in the Alto Paraguay Department, near the Bolivian border, in one of the country's most remote areas. Historically, the region was the site of significant military maneuvers during the Chaco War (1932-1935). Today, the mountain remains a symbol of the Chaco wilderness and a key destination for geological research and demanding scientific expeditions.

Best time to visit & climate

The most pleasant time to visit is Jun–Aug.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg °C	30	29	28	27	23	22	22	25	27	30	30	30
Rain mm	103	116	95	62	41	17	10	7	17	52	77	96

📋 Practical info

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Getting there

This significant hill is located deep within a remote, flat region and is mostly accessible only via long, dusty dirt tracks. The approach almost always requires an off-road capable vehicle, as the unpaved paths have deep ruts and washboarding in places.

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Best season

Due to the extreme heat experienced in summer, visits during the cooler winter months are far more tolerable and generally safer. When it does rain heavily in this arid zone, the dusty tracks can very rapidly transform into impassable, sticky mud.

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Terrain & paths

The hill stands out strikingly from the otherwise flat, often thorny shrub savanna of the surrounding immediate landscape. The ascents are mostly stony and lined with resilient, scratchy vegetation, making walking anywhere off the beaten path quite arduous.

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What to bring

In addition to sturdy, closed footwear, long, thorn-resistant trousers are absolutely recommended to actively prevent deep scratches. A very large supply of drinking water is mandatory, as there are practically no reliable water sources in the wider vicinity.

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Parking

Parking lots in the classical sense are completely absent; vehicles are left at the end of the tracks or near a local ranger post. You simply park wherever the terrain safely permits and where the car does not unnecessarily block the passage for others.

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Safety

Given the indigenous significance of the site, it is absolutely imperative to behave respectfully and strictly observe any local access rules. Furthermore, one must always keep a watchful eye out for snakes and scorpions that like to hide under loose rocks.

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Time needed

Since the journey there alone takes up a great deal of time, this excursion is often planned as a demanding, full-day project. However, the hike on and around the actual hill itself can usually be completed quite comfortably in about two to four hours.