You walk along the Caminito del Rey and see rock walls rising 400 meters in an almost perfectly vertical line. The reservoir water has that impossible green-turquoise color. Vultures circle above the canyon. All of it has an explanation that makes the experience more interesting if you know it before you go.
Why the walls are so vertical
The walls of the Gaitanes Gorge are made of Jurassic and Cretaceous limestone, between 150 and 200 million years old. Limestone has a special characteristic: it fractures along very defined planes under pressure, which produces almost perfectly vertical walls instead of rounded slopes.
The gorge was formed by the action of the Guadalhorce River, which over millions of years cut down through the rock vertically, following the natural fracture lines. The result is a very narrow, deep U-shaped canyon, completely different from the V-shaped valleys formed by more gradual erosion.
The narrowness of the gorge — in some spots barely 10-15 meters wide — is a direct consequence of this type of rock: limestone resists laterally but allows the water to cut straight down.
The color of the water: turquoise isn't quite turquoise
The characteristic color of the El Chorro reservoir and the Guadalhorce River in the gorge isn't constant — it changes throughout the year and with weather conditions.
In spring and after rain, the water appears intense emerald green. In summer, when the water level drops, it shifts toward a lighter blue-turquoise. In autumn, with the first rains carrying sediment, it can turn more brownish-green.
The color comes from a combination of three factors:
- Suspended mineral sediment, mainly carbonates washed down from the limestone rock
- Microscopic algae living in the water in varying concentrations depending on temperature and light
- Depth and light reflection: in shallow, clear water, the blue-green wavelength is the one most reflected
The reservoir is at its highest level (and most intense color) in spring, after the winter rains. By August, after months of drought, the level drops and the color becomes paler.
The gorge's wildlife
Griffon vultures
They're the canyon's most visible residents. The colonies of griffon vultures nesting in the cracks and ledges of the gorge's walls are among the most important in the province of Málaga.
Vultures use the updrafts generated inside the canyon to glide effortlessly for hours. On warm days, when hot air rises along the rock walls, it's common to see 10-15 vultures in the air at once.
The best time to see them: from around 10-11am, once the air starts warming up. Early in the morning, with the canyon still cool, they rarely fly.
Swifts and kestrels
The cracks in the limestone are also home to common swifts and lesser kestrels. Swifts are hard to photograph because they fly very fast, but they're easy to identify by their sickle-shaped silhouette and sharp call. Kestrels are recognizable by their hovering flight — they hang motionless in the air, beating their wings.
Spanish ibex
In the more inaccessible stretches of the gorge there's a presence of Spanish ibex (Capra pyrenaica hispanica). They're harder to spot from the walkways because they favor the steepest areas, but they're occasionally seen in the lower parts of the canyon, near the river.
Rupicolous flora
In the cracks of the limestone grows a specialized vegetation known as rupicolous (rock-dwelling) flora. Plants like rock everlasting (Helichrysum stoechas), small ferns in damp areas, and various species of saxifrage cling to the rock where there's practically no soil.
In spring, some stretches of the canyon take on a golden-yellow hue on the walls from these plants blooming. It's one of the details that most surprises visitors who didn't expect to find vegetation on vertical rock.
Why there are train tunnels in the gorge
The Gaitanes Gorge is so narrow that the Málaga-Córdoba railway line, built in the early 20th century, couldn't be routed along the canyon's edge — it had to go inside the rock. The tunnels you see from the walkways, some several hundred meters long, were carved into the limestone so the train could cross the gorge.
From the walkways you can see the tunnel mouths, and if your timing is right, the moment a train emerges from a tunnel is a striking sight: the sound arrives before the train, which suddenly appears between the rock walls.
The Gaitanes Gorge Natural Area
The surroundings of the Caminito del Rey are part of the Gaitanes Gorge Natural Area (Paraje Natural del Desfiladero de los Gaitanes), a protected area covering 2,060 hectares. The canyon itself is about 4.5 km long, although the Caminito route only covers a stretch of the gorge.
There are areas of the natural park that visitors can't access from the walkways — the deepest, most inaccessible parts of the canyon, where wildlife and flora are more protected and where the walls are the most vertical in the entire gorge.
Next time you're on the walkways looking at the 400-meter walls, you'll be looking at 200 million years of geological history and the result of water always finding the steepest possible path downward.
✓ Guaranteed Availability 2026
Ready to visit Caminito del Rey?
Official tickets sell out months in advance. Book your guided tour with free cancellation up to 24 h before.
See availability and price →⚡ Free cancellation · Instant confirmation