Boca do Inferno (
Portuguese for Hell's Mouth) is a
chasm located in the seaside cliffs close to the
Portuguese city of
Cascais
Cascais () is a town and municipality in the Lisbon District of Portugal, located on the Portuguese Riviera, Estoril Coast. The municipality has a total of 214,158 inhabitants in an area of 97.40 km2. Cascais is an important tourism in Port ...
, in the
District of Lisbon. 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 known as a movie or motion picture, is a work of Visual arts, visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, emotions, or atmosphere through the use of moving images that are gen ...
s, in the 1896 British film ''
A Sea Cave Near Lisbon'', which shows waves breaking at the mouth of the cave.
References
{{Lisbon-geo-stub
Geology of Portugal
Cascais e Estoril