Boca do Inferno (

Portuguese Portuguese may refer to: * anything of, from, or related to the country and nation of Portugal ** Portuguese cuisine, traditional foods ** Portuguese language, a Romance language *** Portuguese dialects, variants of the Portuguese language ** Portu ...

for Hell's Mouth) is a

chasm In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics. Typical rift features are a central linear downfaulted depression, called a graben, or more commonly a half-graben w ...

located in the seaside cliffs close to the

city of

Cascais Cascais () is a town and municipality in the Lisbon District of Portugal, located on the Portuguese Riviera. The municipality has a total of 214,158 inhabitants in an area of 97.40 km2. Cascais is an important tourism in Portugal, tourist de ...

, in the

District of Lisbon Lisbon District ( pt, Distrito de Lisboa, ) is a district located along the western coast of Portugal. The district capital is the city of Lisbon, which is also the national capital. From its creation until 1926, it included the area of the cu ...

. The seawater has access to the deep bottom of the chasm and vigorously strikes its rocky walls, making it a popular tourist attraction. The cave was the first to be depicted in

moving picture A film also called a movie, motion picture, moving picture, picture, photoplay or (slang) flick is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, feelings, beauty, or atmosphere ...

s, in the 1896 British film ''

A Sea Cave Near Lisbon ''A Sea Cave Near Lisbon'' is an 1896 British short silent actuality film, directed by Henry Short, featuring a view looking out to sea through the Boca do Inferno (Hell's Mouth) cave near Lisbon, with waves breaking in. The film was popular ...

'', which shows waves breaking at the mouth of the cave.

References

{{Lisbon-geo-stub Geology of Portugal Cascais e Estoril