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Hell Mouth / Boca do Inferno

Cascais Area

Boca do Inferno is an interesting cliff formation close to Cascais, which has been given an overly dramatic name of Hell’s Mouth. The ceaseless pounding of the Atlantic Ocean on the cliffs chiseled out a small cave, which subsequently collapsed forming a small bay and natural arch.

In the summer these waves merely splash around in the open cave but during winter storms the full force of the ocean is funneled into chasm which gives rise to the name of the rock formation. Boca do Inferno is a popular excursion from Cascais, commonly as a short walk or bike ride. At Hell's Mouth there are pathways allowing tourists to climb down the cliff face and view the unique formation from both sides.

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