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on the continental shelf, it has an average depth of about 120 m at its widest; yet averages about 45 m between Dover and Calais, its notable sandbank hazard being Goodwin Sands. Eastwards from there the adjoining North Sea reduces to about 26 m across the Broad Fourteens (14 fathoms) where it lies over the southern cusp of the former land bridge between East Anglia and

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