Sierra Negra Sulfur Mines Trail

Sulfur dioxide plays a vital role in volcanic activity. During eruptions, this gas condenses into a reddish liquid and, as it cools, solidifies into the yellow sulfur deposits found throughout the caldera. For many years, these deposits were mined for use in chemical and pharmaceutical processes. Although mining has ceased, the dramatic and rugged landscape of the sulfur mines remains largely unchanged. The experience includes a 2.5-hour walk into the Sierra Negra caldera and sulfur mines area, offering close-up views of volcanic formations and sweeping panoramas of Isabela Island. The route also includes a visit to Cueva de Sucre, a natural lava cave historically used as shelter by early settlers and workers, providing insight into human life in Isabela’s remote highlands. The tour continues to El Mango, a peaceful highland area known for its lush vegetation, endemic birdlife, and traditional agricultural surroundings—an ideal spot to rest and connect with the island’s rural culture. This adventure provides a deeper understanding of Sierra Negra’s ongoing volcanic activity, Isabela’s history, and its unique landscapes. A camping option is available for travelers seeking an extended highlands experience. What's included? - All necessary equipment - Boxed lunch - Transportation to and from hotel - PNG Naturalist Guide What's not included? - Tips for guide/tour leader - Pictures - Drinks other than water ​Additional Information - Mandatory to bring sporty and comfortable shoes, a cap, water, and sunscreen. - This tour is available all year, every day. However, it may be rescheduled or canceled if it's not safe to go due to volcanic activity. Safety first!