Argentina — Argentine Sierras outside the Andes: Sierra de la Ventana

Regional overview

Sierra de la Ventana is the main walking area of the Ventania system in Buenos Aires province. It is much lower than the Andes or the Cordoba highlands, but the quartzite ridges are steep, rocky and weather-exposed. The landscape is open pampas grassland, folded rock, narrow ravines and small waterfalls.

The main centres are Sierra de la Ventana, Villa Ventana, Tornquist and the Parque Provincial Ernesto Tornquist access points. Some routes are inside the provincial park and may require registration, fees, guide accompaniment or fixed start times. Cerro Tres Picos lies on private land associated with Estancia/Fundacion Funke.

Summer heat, strong wind, winter frost and occasional snow all affect route seriousness. The area is also fire-sensitive.

Selection rationale

The selection combines the named Cerro Ventana, the highest Ventania summit, a park viewpoint summit, a ravine/waterfall walk and a pool/ravine walk.

Summary table

1. Cerro Ventana

Itinerary

The ascent starts at the Cerro Ventana sector of the provincial park and climbs a marked mountain path toward the famous natural window near the summit ridge. The route returns by the same line.

Why it is essential

This is the named formation that gives the whole Sierra de la Ventana region its identity, and it is the classic objective in Parque Provincial Ernesto Tornquist.

Equipment

Mountain hiking equipment: sturdy shoes/boots, sun and wind protection, warm layer, water, food and headtorch margin.

Hazards and notes

AllTrails states a park-ranger guide is required and excursions start at 08:00. Current access rules must be checked with the park before travel. The upper route is exposed to wind and weather.

External links

• AllTrails — Cerro de la Ventana
• Parque Provincial Ernesto Tornquist
• Cerro Ventana

2. Cerro Tres Picos

Itinerary

The route leaves the Funke access area, follows the shared approach used for Cerro Naposta, then forks toward the Tres Picos summit. It is a long, open day with sustained ascent and returns on the same line.

Why it is essential

Cerro Tres Picos is the highest summit in the Ventania system and the highest point in Buenos Aires province, making it the region’s major endurance day hike.

Equipment

Mountain hiking equipment, 2-3 litres of water, navigation backup, sun/wind protection and headtorch.

Hazards and notes

The route is on private access land; current permission, fees and rules need confirmation. Heat, wind and lack of shade are key issues. Some parties split the ascent with camping, but fit walkers can complete it in one day.

External links

• AllTrails — Cerro Tres Picos
• Cerro Tres Picos

3. Cerro Bahía Blanca

Itinerary

The path climbs from the park sector to the Cerro Bahía Blanca summit viewpoint, looking across toward Cerro Ventana and the surrounding folded ridges.

Why it is essential

It is the most accessible proper summit viewpoint in the provincial park and gives a compact view of the park’s geology and ridges.

Equipment

Standard hiking equipment with firm footwear and sun/wind protection.

Hazards and notes

Short rocky ascent. Check provincial park access rules, opening hours and weather.

External links

• AllTrails — Cerro Bahía Blanca
• Parque Provincial Ernesto Tornquist

4. Garganta Olvidada

Itinerary

The trail follows the arroyo channel into Garganta Olvidada, a short ravine below Cerro Ventana where a seasonal waterfall can be present in wet periods.

Why it is essential

It represents the ravine and waterfall side of the provincial park without the commitment of the major summits.

Equipment

Standard hiking equipment. Footwear with grip is important on wet rock.

Hazards and notes

The route is short but slippery when wet. Check park rules; older park summaries describe it as autoguided, while access policies may change.

External links

• AllTrails — Garganta Olvidada
• Parque Provincial Ernesto Tornquist

5. Los Piletones

Itinerary

The walk follows park tracks toward the piletas/pools and small waterfall features, passing ravine and woodland sections before returning the same way.

Why it is essential

It is a short water-focused route that balances the summit-heavy Ventania selection.

Equipment

Standard hiking equipment with grippy footwear.

Hazards and notes

Wet rock and pool edges require care. Swimming status and park rules were not verified; confirm locally.

External links

• AllTrails — Los Piletones
• Parque Provincial Ernesto Tornquist

External links