Boca do Inferno is a chasm located in the seaside cliffs close to the Portuguese city of Cascais, 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.
Picture from Zoltan Tasi who have traveled to Boca de Inferno
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25 km (15.3 miles) away from Boca de Inferno