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Portland Bill, 2001. The southern tip of the Isle of Portland forms a major headland that protrudes some 10km into the English Channel. It forms a key regional sediment transport boundary where southward directed seabed pathways on each side of the "Isle" converge and transport sand offshore. The cliffs are formed of hard Portland Stone and retreat extremely slowly. They drop directly into deep water where the bed is scoured by strong tidal currents.