Caldeiras das Furnas (thermal pools)
Caldeiras das Furnas is a surreal landscape of bubbling fumaroles and iron-rich volcanic springs set within a lush, steam-shrouded crater basin. It is the epicenter of Azorean geothermal activity and a primary destination for experiencing the island's raw, living geology.
Essential for those wanting to experience the visceral power of volcanic activity, though the pungent sulfur scent is not for the faint of heart.
Why go
Visiting offers a rare, up-close encounter with Earth's inner workings; the sight of mud pots churning and steam venting from the earth is hypnotic. You can witness the local tradition of 'cozido'—a stew cooked entirely by the heat of the volcanic ground—and soak in the therapeutic, mineral-dense thermal waters nearby.
Why you might skip it
Skip this if you are highly sensitive to strong sulfur smells, which can be overwhelming for some, or if you prefer serene, odor-free nature walks. Those seeking a tranquil, isolated wilderness experience may be deterred by the high volume of tourists that congregate around the main boiling pools.
What to do
Stroll the designated wooden boardwalks to view the active fumaroles safely, watch workers unearth pots of cozido from the soil pits, and visit the nearby thermal pools for a soak in orange-tinted, iron-rich water.
History & origin
Furnas is located inside a massive volcanic caldera that collapsed roughly 100,000 years ago. The area has been used for centuries by locals to cook food underground and utilize the therapeutic properties of the geothermal springs, which were recognized early on as a major draw for wellness tourism in the Azores.
Getting there & around
Located in the town of Furnas on São Miguel Island, the area is well-marked with parking available near the main crater visitor points.
The site is easily navigated on foot via well-maintained paths and boardwalks that lead directly through the geothermal field.
Common planning mistakes
Many visitors arrive too late in the day to witness the midday 'cozido' extraction ritual and fail to bring a towel for the thermal pools, forcing them to rent or buy one on-site.
Less ideal for
Travelers with respiratory sensitivities and those looking for remote, quiet hiking trails.
Practical notes
Wear dark-colored swimwear, as the high iron content in the water can stain light fabrics. Bring a waterproof layer for the mist and prepare for a lingering sulfuric scent on your clothes.
Where it sits
