The Sussex Downs, between Eastbourne and Brighton.
The Seven Sisters cliffs are made of chalk that formed where the South Downs meet the sea. The cliffs are receding at about 30-40cm each year on average. The process is intermittent with major falls occurring after heavy rain or rough seas, often two of three times per year. Where these falls occur they protect the base of the cliffs from the sea and usually there are no falls in the same places for eight or nine years until the sea undercuts the cliffs again.