Sierra Negra Volcano Hike, Galápagos: Complete Guide

If you do one hike in the Galápagos, make it Sierra Negra. On Isabela Island sits one of the largest active basaltic calderas on Earth — roughly 9–10 km across — and a trail leads right to its rim and on to the surreal lava fields of Volcán Chico. It’s the single best reason to experience the islands on foot, land-based rather than only from a boat.

What is Sierra Negra?

Sierra Negra is a massive shield volcano, still very much active — it last erupted in 2018. Its caldera is so wide that standing on the rim you can’t take it all in: a black sea of solidified lava stretching to the far wall. Beyond it, Volcán Chico is a younger vent area of red, ochre and yellow rock, steaming fumaroles and otherworldly formations.

The hike: distance and difficulty

• Distance: ~16 km round trip (caldera rim + Volcán Chico)
• Time: about 5–6 hours
• Difficulty: easy to moderate — long but not steep; the challenge is the distance, sun and sometimes muddy start
• Elevation: modest (around 1,000 m) — this is not a high-altitude climb like the mainland volcanoes

The first stretch up to the rim can be muddy after rain; the section out to Volcán Chico crosses open lava with little shade. Bring at least 2 litres of water, sun protection and decent walking shoes.

Do you need a guide?

Yes. Sierra Negra is inside Galápagos National Park, and a licensed naturalist guide is required for this trail. That’s not just bureaucracy — the guide reads the weather, knows the lava terrain, and brings the geology and ecology of an active volcano to life. We arrange exactly this as part of a land-based itinerary.

What you’ll see

• The vast Sierra Negra caldera from the rim
• Volcán Chico’s painted lava fields and fumaroles
• Endemic plants reclaiming the lava — and often Galápagos hawks overhead
• Long views across Isabela to the sea

How it fits a multi-day Galápagos hike

Sierra Negra is the centrepiece of a day on Isabela. It pairs naturally with the Wall of Tears and the island’s beaches and lagoons — and slots into a multi-day, land-based Galápagos hiking itinerary that also takes in Santa Cruz. It’s the Galápagos most visitors never experience: the islands on foot, on an active volcano.

Want to walk the Galápagos instead of just cruising past it? Our Galápagos hiking trips are built around exactly this.

Quick facts

• Where: Isabela Island, Galápagos
• Caldera: ~9–10 km across, one of the largest active ones on Earth
• Last eruption: 2018
• Hike: ~16 km round trip, 5–6 hours, easy–moderate
• Guide: required (national-park rule)
• Best time: year-round; drier underfoot June–November