Also known as PR9 extension · Hell's Cauldron · colloquially 'PR9.1'
17.4 kmLengthout-and-back
6.5 hDurationtypical
HardGradehard
250 mAscentclimb
highExposurevertigo
PR9Trailofficial PR
Not a separate trail but the full extent of the official PR9: from Caldeirão Verde the channel pushes a further ~2.4 km through a string of narrow, often flooded tunnels into the Caldeirão do Inferno, a sheer-sided canyon closed by a final towering waterfall. This is the demanding end of the route — guidebooks count around eleven tunnels in total and rate the complete out-and-back as hard, a full day of 6–7 hours or more. The popular shorthand 'PR9.1' for this extension is a misnomer: the official register names the whole Queimadas–Caldeirão Verde–Caldeirão do Inferno line as PR9, while the real PR9.1 is a short accessible path (Queimadas–Pico das Pedras) elsewhere.
Highlights
Continuation of PR9 beyond Caldeirão Verde into a sheer-walled canyon
One of the most adventurous full-day levada hikes on the island
Raw, untouched interior Laurisilva and basalt cliffs
Water on the route
Caldeirão Verde waterfall (~100 m)
Caldeirão do Inferno canyon and its towering final waterfall
deep ravine gorges of the levada
🔦
Tunnels: ~11 tunnels in total over the full route (4 to Caldeirão Verde, then more, narrower and frequently flooded, on the Inferno section; some over 200 m) — torch essential. Bring a head-torch — some levada tunnels are long, low and pitch black.
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