Isla del Pescado: Cactus Island in Salar de Uyuni

Isla del Pescado rises 3,656 meters above sea level in the middle of Salar de Uyuni, the world's largest salt flat. The island covers just 24.62 hectares but holds thousands of giant cacti, some over 10 meters tall and estimated to be hundreds of years old. Entrance costs about 30 bolivianos (roughly $4), and the island is only reliably accessible by 4x4 during the dry season, from May to November.

What Makes Isla del Pescado Unique

The island is a rocky outcrop of fossilized coral and volcanic rock, a remnant of prehistoric lakes that once covered the Altiplano. Its name, Fish Island, comes from its elongated shape, which resembles a fish when seen from a distance—especially during the rainy season when shallow water surrounds it.

Geology and Formation

Around 40,000 years ago, the area was part of Lake Minchin, a giant prehistoric lake. When it dried up, it left behind the salt flats and isolated rocky islands like Isla del Pescado. The island itself is composed of coral and volcanic material, proof that this was once underwater. The surrounding salt crust is over 140 meters thick in places.

The Giant Cacti

The island is covered with Trichocereus cacti (also known as Echinopsis atacamensis). These columnar cacti grow extremely slowly—about 1 centimeter per year after reaching 1 meter in height. Many specimens here exceed 10 meters, meaning they are over 1,000 years old. The dense forest of cacti creates a surreal contrast against the white salt flat.

Visiting Isla del Pescado: Practical Information

Location and Access

Isla del Pescado is located in the southern part of Salar de Uyuni, about 22 kilometers from the nearest shore. It is most easily reached from the town of Uyuni, which is served by flights from La Paz and buses from various Bolivian cities. The drive from Uyuni to the island takes about 1.5 to 2 hours by 4x4, depending on conditions.

Tours and Costs

Most visitors join a guided tour from Uyuni. A standard full-day tour costs around 150-250 bolivianos per person (about $20-35), including transportation, a guide, and lunch. The entrance fee to Isla del Pescado is 30 bolivianos (subject to change; check locally). Tours usually combine the island with other attractions like the Train Cemetery and the salt flat's eye-watering hexagonal salt tiles.

Best Time to Go

The dry season (May to November) is the best time to visit. The salt flat is hard and dry, allowing vehicles to drive right up to the island. Days are warm (15-20°C) but nights can drop below freezing, especially in June and July. The rainy season (December to April) turns the salt flat into a mirror, but the island is often inaccessible due to flooding. If you want the famous reflection photos, aim for late December to March, but be aware that you might not be able to set foot on the island itself.

Hiking and Photography at Isla del Pescado

A loop trail winds through the cacti and up to the island's summit. The hike takes about 45 minutes to an hour at a leisurely pace, with some steep sections. The trail is well-marked, but the altitude (3,656 meters) can make it feel tougher than it looks—take your time and drink water.

From the top, you get a 360-degree view of the endless white salt flat. On clear days, you can see the outline of the surrounding mountains and volcanoes. The best light for photography is early morning or late afternoon when the sun is low and casts long shadows. The cacti silhouettes against the bright salt are a classic shot.

There are basic facilities at the island's base: a restaurant serving simple meals (often included in tours), and toilets. The restaurant is a good spot to refuel after the hike.

Frequently Asked Questions

How high is Isla del Pescado?

The island's highest point is 3,822 meters above sea level, while the salt flat itself is at 3,656 meters. That means the trail climbs about 166 meters—enough to feel the thin air.

Is the island accessible during the rainy season?

Rarely. From January to March, the salt flat is often covered in water, making it impossible for vehicles to reach the island. Some tours may offer alternative routes, but it's best to plan your visit for the dry season.

Do I need a guide to visit?

Yes, unless you have your own 4x4 and extensive experience driving on salt flats. The vast, featureless landscape makes navigation difficult, and conditions can change quickly. Joining a tour is the safest and most practical option.

What should I bring?

Sunglasses, sunscreen, a hat, and layers. The sun is intense at this altitude, and temperatures can swing from warm to cold within hours. Bring water and snacks, even if your tour includes lunch. A small backpack is useful for the hike.