Walk Inside an Active Volcano: Sulfur Mines Fumaroles Experience
Overview
Available languages
Mobile ticket
Step into one of the most raw volcanic landscapes in the Galápagos. This guided hike crosses the Sierra Negra caldera to the sulfur mines, where steaming fumaroles and yellow deposits reveal active geology.
* Walk inside one of the largest volcanic calderas on Earth
* See active fumaroles and sulfur vents up close
* Reach a remote, otherworldly landscape few visitors see
* Learn from a certified naturalist guide about volcanic history
Start with a drive from Puerto Villamil through lush highlands into the stark Sierra Negra volcano. Hike across lava fields and volcanic rock on a moderately challenging trail. As you near the mines, sulfur fills the air and the landscape transforms. At the site, explore steaming vents and mineral formations while your guide explains the geology and history of sulfur extraction.
* Difficulty: Moderate (uneven volcanic terrain)
* Ideal for: Adventure travelers, nature and geology lovers
* Not suitable for: Limited mobility or sulfur sensitivity
Additional Info
Service animals allowed
Not recommended for travelers with spinal injuries
Not recommended for pregnant travelers
Not recommended for travelers with poor cardiovascular health
Travelers should have at least a moderate level of physical fitness
What To Expect
Sierra Negra
Embark on an unforgettable trek to the sulfur mines of Isabela Island and experience a unique volcanic landscape shaped by geological forces. This guided adventure starts with a drive from Puerto Villamil through lush highlands, gradually giving way to the stark, barren terrain of the Sierra Negra volcano. The journey includes a moderately challenging hike along rocky paths and ancient lava formations. As you ascend, take in the rugged beauty of the volcano's slopes, dotted with low shrubs and unique endemic plants. The air becomes tinged with a distinctive sulfur scent, signaling your approach to the mines. Upon arrival, explore the yellow-streaked fumaroles and vents, where geothermal activity creates a surreal atmosphere. Your guide will offer fascinating insights into the volcanic activity that formed this area and explain the historical significance of the sulfur mines, once a source of valuable minerals.
Options
Express Sulfur Fumaroles
Duration: 3 hours Pickup included
Isabela Island Sulfur Mines Hike: Explore Volcanoes and Fumaroles
Duration: 4 hours Snacks 4x4 Wheel drive pick up Pickup included
What‘s Included
Private transportation
English, Spanish Guide
Please let us know about you diet requirements/ allergies
Air-conditioned vehicle
Gratuities
Pickup points
Iguana Crossing
Av. Antonio Gil, Puerto Villamil Ecuador
La Gran Tortuga
Avenida las Fragatas y 16 de Marzo Puerto Villamil Ecuador
Casa Rosada Galapagos
Ave. Antonio Gil Puerto Villamil Ecuador
The Wooden House Lodge
Av. Conocarpus, Via Al Embarcadero Arenillas Puerto Villamil Ecuador
Hotel La Casa De Marita
Av. Conocarpus, Puerto Villamil Ecuador
Cancellation Policy
All sales are final. No refund is available for cancellations.
Reviews
1 review
Total reviews and rating from Viator & Tripadvisor
The perfect private guided experience through Isabela’s sulfur crater
elisapV3500TC,Aug 13, 2025
- Review from Tripadvisor
5.00I booked this private tour and was fortunate to have Andres as my guide. He picked me up from my hotel with a driver, and together we reached the crater by car. The landscape was otherworldly – vast, quiet, and almost lunar. Andres was incredibly knowledgeable, answering all my questions about the Galapagos, the volcanic origins of the islands, and the history of this particular crater. His explanations brought the place to life and made the experience truly memorable. I would recommend this tour to anyone visiting Isabela – it’s definitely the highlight of the island’s inland attractions.
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Operated by Galapagos Outdoors CL