Boca do Inferno, Cascais

#1 of 7 in Nature in Lisbon District
Must see · Geologic Formation · Nature / Park
Boca do Inferno, or "The Mouth of Hell," features a natural rock arch with a cave that is known for sucking in ocean waves and shooting water out the top. Nestled in a dramatic environment of eroded cliffs and enormous waves, the site is a well-known photography spot. You can easily reach it by foot, and then follow stairs and bridges around it to get a better view or climb down to the cave if the ocean is calm. Be aware, however, that locals advise against climbing due to the sharp rocks. To visit Boca do Inferno and get the most from your holiday in Cascais, create itinerary details personal to you using our Cascais itinerary planning website.
Create an itinerary including Boca do Inferno
© OpenMapTiles © OpenStreetMap contributors

Boca do Inferno reviews

Rate this attraction
TripAdvisor traveler rating
TripAdvisor traveler rating 4.0
4,064 reviews
  • It's a really nice walk from Cascais city center to get here, and then you get rewarded by the sight of raw, powerful nature...giant waves crashing into the rocks, what a great show to watch!  more »
  • This is a pretty spectacular geological feature of sea arches and cliff formations. On a wilder day, water shoots up eruption-like through crevices and caves below and when you stand at the precipice....  more »
  • Amazing rock formation at the sea. Take a walk along towards Cascais to explore even more. The nature is remarkable. And if you return take a bite and have a drink at the "Rocha do Inferno" at the entrance. It worth a visit regardless the weather. Actually, is the weather is stormy, it is much more dramatic.
  • Interesting place to see. You can really see the power of the ocean here. Unfortunately, as in such a place, there are usually a lot of people. In close proximity there are toilets and a few pubs - but no revelations. There is a bus stop nearby, and there are parking spaces for private cars. If you are close you should come and see!

Plan your trip to Cascais

  • Get a personalized trip
    A complete day by day itinerary
    based on your preferences
  • Customize it
    Refine your trip. We'll find the
    best routes and schedules
  • Book it
    Choose from the best hotels
    and activities. Up to 50% off
  • Manage it
    Everything in one place.
    Everyone on the same page.