Portugal canyon rim
Boca do Inferno
You can see 48 km from here, looking south-east.
Calculating the panorama…
Drag to turn around. The relief is drawn 2.2 times taller so the ridges can be read; far ridges are paler, as in the real air.
The view
Up to 48 km away.
Calculated on the relief one degree at a time, up to 250 km, with the curvature of the Earth and the refraction of the air: what stands above the horizon from here.
Our own rating, from the relief and the climate only: open horizon (35 points), how far you see (25), sea and named peaks in view (20) and clear months (20).
- 48 kmFarthest ridgelooking south-east
- 99%Open horizonof the circle where the horizon is below your eyes
- 36%Seaof the circle where the horizon is the sea
- 1Peaks in viewnamed summits that rise above the relief in front
- 25 mAltitudeabove the sea, at the highest point of the viewpoint
The 1 peaks you can name from here
From west to east as you turn around: height, distance and direction. Each one links to its guide on Peakyas, our mountain atlas.
From the relief only: buildings, trees and haze are not in the model. On a hazy day you see much less; 250 km is the limit of our calculation.
The sun
The best sunsets are from July to August.
When the sun really disappears from this viewpoint — behind the relief or into the sea — and in which direction, on the 15th of each month, in local time.
- Jansouth-west4 min before the sea-level sunset38%
- Febwest4 min before the sea-level sunset42%
- Marwest4 min before the sea-level sunset39%
- Aprwest6 min before the sea-level sunset43%
- Maynorth-west12 min before the sea-level sunset48%
- Junnorth-west14 min before the sea-level sunset51%
- Julnorth-west14 min before the sea-level sunset55%
- Augwest8 min before the sea-level sunset59%
- Sepwest4 min before the sea-level sunset52%
- Octwest4 min before the sea-level sunset42%
- Novsouth-west4 min before the sea-level sunset40%
- Decsouth-west4 min before the sea-level sunset38%
- Time: when the sun goes behind the horizon you see from here.
- Minutes: how much earlier the relief hides the sun.
- %: share of clear sky that month (NASA, 2001–2020).
The highlighted months are the clearest. Golden hour starts about an hour before.
The place
Boca do Inferno.
Tourist attraction in Cascais, Portugal
Boca do Inferno is a canyon rim in Portugal, 25 m above the sea.
On a clear day the farthest ridge you can see is 48 km away, looking south-east.
The sea fills 36% of the horizon.
1 named peaks rise above the relief in front; the most prominent is Arrábida Mountain (501 m), 46 km away.
The horizon is open, below your eyes, over 99% of the circle.
The skies are clearest from July to August.
Get there and stay
- Orbitur Guinchocampsite · 4.7 km · 1 within 10 km
- Hotel Pestana Cascaisplace to stay · 0.9 km · 104 within 10 km
- Cascaisnearest town · 1.0 km in a straight linePlaces to stay in CascaisBooking.com · sponsored link↗
- Cascais Airport (CAT)nearest airport with scheduled flights · 8 km in a straight lineCar hire at LIS airport (Lisbon)Discover Cars · sponsored link↗
Plan the visit
A guided tour, a bed nearby, a car.
Some links above are affiliate links: if you book through them we may earn a commission, at no extra cost to you. It never changes what the data on this page says.
From above
The viewpoint and its surroundings.
The satellite image of the 6 × 6 km around the viewpoint, with what OpenStreetMap shows nearby.
Around, in OpenStreetMap
- 14other viewpoints within 5 kmAnfiteatro Natural da Pedra do Sal and 13 more
- 5marked trails within 3 kmRota do Cabo Raso, Trilho das Areias, Rota do Ocidente - Etapa 1 and 2 more
- 30shelters and huts within 5 kmCasa and 29 more
- 152car parks within 3 km
- 6visitor centres within 5 kmPosto Turismo, Centro de Interpretação da Duna da Cresmina and 4 more
- 323restaurants and cafés within 3 km
- 1campsites within 10 kmOrbitur Guincho
- 104places to stay within 10 kmHotel Pestana Cascais, Pousada de Cascais, Cascais Bay Hostel and 101 more
- named peaks within 5 km
- cable car and funicular stations within 5 km
Counted in OpenStreetMap, the map anyone can edit. A low number may just mean nobody has mapped it yet.
In our other atlases
What you see from Boca do Inferno, and what is near.
Everything around this viewpoint — mountains, water, forests, birds, caves and the night sky — in the family's atlases.
Peakyas22 mountains within 25 km
Coastya47 beaches within 10 km
Darkskyas2 dark-sky places within 30 km
Canyonyas1 canyons within 20 km
Cavernyas1 caves within 20 kmFigures from the sister sites' databases (Wikidata, HydroATLAS, GeoNames, OpenStreetMap, GBIF). Links open when each site is online.
Photographs
The view, as people saw it.
Other viewpoints nearby.
Boca do Inferno
Portugal
- 63Viewyas Score
- 48 kmFarthest ridge
- 1Peaks in view
- 25 mAltitude
Miradouro da Graça
Portugal · 26 km
- 64Viewyas Score
- 102 kmFarthest ridge
- 1Peaks in view
- 92 mAltitude
Miradouro da Senhora do Monte
Portugal · 26 km
- 64Viewyas Score
- 102 kmFarthest ridge
- 1Peaks in view
- 95 mAltitude
Miradouro de Santa Catarina
Portugal · 25 km
- 60Viewyas Score
- 89 kmFarthest ridge
- 1Peaks in view
- 57 mAltitude
Where these figures come from
| Name and type | Wikidata (Q888949) · CC0 |
|---|---|
| Sun | J. Meeus, Astronomical Algorithms |
| Peaks in view | Peakyas (Wikidata, CC0) |
| Panorama and altitude | Copernicus DEM GLO-90 / GLO-30 · © DLR e.V., © Airbus Defence and Space GmbH, Copernicus/ESA |
| Clouds | NASA POWER (CERES SYN1deg, 2001–2020; MERRA-2) |
| What is around | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
| Sister atlases | Peakyas, Coastya, Birdyas, Darkskyas, Canyonyas, Cavernyas |
Every figure is an average, an estimate or a count from a public dataset. Licences and methods: data sources.
The family
Do you prefer beaches, lakes, mountains, waterfalls, islands, rivers, canyons, caves, dark skies, viewpoints, birdwatching or forests?
Same idea, other landscapes: field atlases built on open data, in seven languages.
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lakes
Every lake on Earth: water temperature, ice, depth and the shore.Visit mountains
Every summit in 3D: summit weather, the 0 °C line, huts and trails.Visit 
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Every waterfall: height, flow month by month and when it roars.Visit 
islands
Every island from the sea up: size, sea temperature, ferries and 3D.Visit 
rivers
Every river from source to sea: the journey, the flow and the basin in numbers.Visit canyons
Every canyon cut to scale: depth to the floor, rim and floor temperatures, trails and viewpoints.Visit caves
Every cave with its real depth and length: the rock above, the temperature inside all year, and how to visit.Visit dark skies
Where the night is still dark: the sky of every place, the Milky Way month by month, the Moon, eclipses and auroras.Visit 
viewpoints
Every viewpoint with its real 360° panorama: the peaks you can name, how far you see and where the sun sets.You are here
birdwatching
Every bird sanctuary and wetland with the species recorded month by month: who is resident, who comes for the summer, who only passes through.Visit 
forests
Every forest with its land-cover rings, what grows and lives in it, and the best months to walk it.Visit