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The Dover Coastguard has said that the collapsed chalk extends about 150 yards (137m) from the base of the cliff and is 20 feet (6m) high in places.
Ramblers, who frequent the path that runs along the top of the iconic cliff-face, have been warned of the danger.
Several tonnes of chalk from the White Cliffs of Dover have collapsed into the English Channel following the recent wet and windy weather.
Fierce winds on the English coastline and rain, which was absorbed into the chalk, caused the famous cliff to weaken.
A large section of the cliff face tumbled to the shore near St Margaret's Bay.