The Río Vilama Traverse (Guatín to Vilama) is a 19.5 km point-to-point hike with a net descent of 750 m, linking the pre-Andean foothills at Guatín (3,200 m a.s.l.) with the ancestral Vilama area (2,450 m a.s.l.) in the Catarpe valley. Unlike the short 2 to 3 hour outings in the upper part of the canyon or at the Catarpe viewpoints, this is the complete canyon traverse, following the whole course of the Vilama river downstream.
It is one of the wildest and most intense experiences among the best treks in San Pedro de Atacama, ideal for hikers who want a full day of total isolation, continuous water crossings and an impressive ecological transition.
Understanding the Area: Why Are There Several Routes at Guatín and Vilama?
Guatín is the confluence where the Puritama river (warm water) meets the Purifica river (cold water), giving birth to the Vilama River. Depending on your goal and the time you have, the area offers three very different hikes:
- Guatín Canyon Trek (Cardones to Puritama): A short 8 km route (3 hours) heading upstream along the Puritama river to the hot springs. Ideal for acclimatization.
- Waterfalls and Cactus Trek: A short 4 to 5 km loop (2.5 hours) exploring the waterfalls and the slopes covered in cardón cactus.
- Río Vilama Traverse (Guatín to Vilama 20k): The big hike downstream described in this guide. It covers the 19.5 km of canyon, descending to the Vilama area and the pre-Hispanic archaeological ruins.
Technical Sheet for the 20k Traverse
| Parameter | Technical Detail |
|---|---|
| Total distance | 19.5 km (linear, point to point) |
| Estimated time | 6 to 8 hours of walking |
| Cumulative elevation | +60 m / -750 m (continuous descent) |
| Starting altitude | 3,200 m a.s.l. (Guatín crossing / Route B-245) |
| Ending altitude | 2,450 m a.s.l. (Vilama area / Catarpe access checkpoint) |
| Physical difficulty | Demanding (long distance on uneven terrain and river bed) |
| Technical difficulty | Medium (dozens of water crossings, slippery boulders and narrow sections) |
| Required logistics | Needs a point-to-point transfer (drop-off at Guatín, pick-up at Vilama/Catarpe) |
Our Take: Why This Traverse Is Unique in Atacama
Most visitors to San Pedro de Atacama only know the tourist sections reachable by vehicle. The full Guatín to Vilama traverse, however, goes deep into the middle canyon, an area no motor vehicle can reach and where the silence is absolute.
- Total isolation: During the 6 to 8 hours on the trail you will almost never meet other groups.
- Changing landscapes: You start in the pre-Andean foothills dotted with centuries-old cardón cacti (Echinopsis atacamensis), move into volcanic tuff canyons and wetland vegetation (cortaderas and pajonales), and finish among the impressive red clay walls and gypsum veins of Catarpe.
- Technical water trekking: You will cross the Vilama river dozens of times. The constant mix of rocks, sand, mud and water turns every kilometer into a fun but exhausting challenge.
The Route Outline
[Guatín / Confluence 3,200m] (Start of Route B-245) ──▶ [Middle Canyon & Wetlands] (River crossings) ──▶ [Narrow Gorges and Petroglyphs] (Clay defiles) ──▶ [Vilama / Catarpe 2,450m] (End / Pick-up)
The Route Step by Step
1. Descent from Guatín and the Cactus Valley (km 0 to 6)
The trek starts at the river confluence in Guatín. After dropping to the river bed, we follow the Vilama river downstream. The first kilometers offer wide walls and slopes covered with imposing cardón cacti.
- Terrain: Intermittent shepherd trail, stony river bed and water crossings where the flow often reaches calf height.
- Tip: Keep a moderate pace on this first stretch so you don't tire your ankles on the loose rocks.
2. The Middle Canyon and the Pre-Andean Wetlands (km 6 to 14)
Halfway along, the canyon deepens. The volcanic rock walls shelter the vegetation and create small wetlands where you can spot waterbirds, lizards and traces of culpeo foxes.
- Key difficulty: The marked trail disappears in several sections; the route consists of following the river bed and looking for the bank with the best passage.
- Narrow walls: In some sections the canyon narrows so much that the water fills the whole width of the passage, forcing you to walk directly in the stream.
3. Exit to the Vilama and Catarpe Area (km 14 to 19.5)
Once past the middle canyon, the volcanic rock gradually gives way to red clay strata and salt formations. The river bed widens and stone pircas (walls) and pre-Hispanic farming ruins appear.
- Final stretch: The trail joins the dirt tracks of the Vilama area that lead to the Catarpe access checkpoint, near the turnoff to the Devil's Throat.
Logistics, Access and Transport
Since this is a one-way 19.5 km route, logistics are a key factor:
- Drop-off / Pick-up transport: You need to arrange a private vehicle that drops you off in the morning (8:00 AM) at the Guatín crossing (Route B-245) and agree on a pick-up at the Catarpe checkpoint 6 to 7 hours later.
- Community fees: Since you enter through Guatín and exit through Catarpe, you must pay the access fees to the local indigenous communities at both ends.
- No mobile coverage: Most of the middle canyon has no phone or mobile data signal. You must carry a satellite communication device or go with a WFR-certified guide.
Essential Gear for the 20k
A gear mistake on a 20 km desert hike is costly. For a thorough guide to clothing and footwear, see our gear and footwear guide for Atacama:
- Well-draining footwear / Trail running shoes: Don't wear heavy waterproof Gore-Tex boots; water will inevitably get in and pool inside. Trail running shoes with a breathable synthetic upper and a non-slip sole (Vibram type) are the best option.
- Trekking poles: Essential for testing the depth of the water, balancing on slippery rocks and cushioning the 750 meters of continuous descent.
- Hydration (minimum 3 liters per person): The water of the Vilama river carries dissolved minerals and salts; it is not drinkable, even with standard filters. You must carry all your drinking water from the start.
- Sun Protection and Light Clothing: Quick-dry pants (avoid cotton), a long-sleeve UV-protection shirt, a wide-brimmed hat and SPF 50+ sunscreen.
Other Related Routes and Experiences in San Pedro de Atacama
- Guatín Canyon Trek (Cardones to Puritama): The short 8 km option heading upriver to the hot springs.
- Devil's Throat and Vilama Canyon Trek: The short 8 km loop through the lower Catarpe area.
- Machuca to Río Grande Trek: Another great 14 km one-way descent through the Atacameño canyons.
- Altitude Sickness Guide: Acclimatization tips to prepare your trekking days on the Puna.
