Boca do Inferno
- Visit: 30–60 min
- Free
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Why go
- The viewpoint near Cascais Marina is among the most photographed on Portugal’s Atlantic coast.
Don't miss
- The rocky chasmNotice how seawater reaches the deep base of the chasm.Boca do Inferno
- Atlantic panoramaTake in the sea cliffs and Atlantic Ocean views.Boca do Inferno
History
The 1st Baron of Água-Izé rode out from Boca do Inferno during visits to Portugal from São Tomé.
- 1896The British silent film A Sea Cave Near Lisbon showed waves breaking at the cave’s mouth.
- 1929Poet Guilherme de Faria died by suicide at the site.
- 1930In September, Aleister Crowley staged his own death there. Boca do Inferno became known as the setting of his staged suicide.
Tips for your visit
- Keep well back from the unprotected cliff edge.
Best time to visit
- On rough-sea days, waves striking the rocks produce booming sounds and spray.
- For sunset scenery, plan an evening visit.
Know before you go
- Open 24 hours daily.
How to get there
- 20 minOn footFollow the coastal promenade from Cascais town centre to Boca do Inferno; the walk takes about 20 minutes.
- BikeFollow the footpath between Cascais Marina and Av. República.
- 40 minTrainTake the train from Lisbon’s Cais do Sodré Station to Cascais; the rail leg takes about 40 minutes. From Cascais, walk about 20 minutes or take a taxi.
- 5 minCarDrive from Cascais town centre; the drive takes about five minutes.
- BusLocal buses and taxis also reach Boca do Inferno.
Interesting facts3
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Rainwater containing dissolved carbon dioxide dissolves carbonate cliff rock, forming cavities and caves in the limestone.
Boca do Inferno (Cascais) - Wikipedia -
The open cavity may be the remains of a cave whose upper layers collapsed.
Boca do Inferno (Cascais) - Wikipedia -
The Atlantic Ocean shaped this coastal formation over thousands of years.
Boca do Inferno - Tripaye Discover Travel, Book with Ease
Sources: Boca do Inferno - Wikipedia · Cascais - Wikivoyage (see) · Boca do Inferno - Tripaye Discover Travel, Book… · Boca do Inferno - Wikipedia · Boca do Inferno (Cascais) - Wikipedia · checked 10 Oct 2026
- Website
- tripaye.com/boca-do-inferno/
Plan from here: Evening walk →
Questions and answers
What does Boca do Inferno mean?
“Mouth of hell”; the name refers to the formation’s shape and the force of its waves.
What is the address of Boca do Inferno?
Av. Rei Humberto II de Itália 642, Cascais.
Is Boca do Inferno still changing?
Yes. Powerful Atlantic waves continue to wear away the rock.
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