Kate Humble's Coastal Britain

Dover (3x3)

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Kate follows the iconic white cliffs of Dover on a 15-mile walk of contrasts. As well as overlooking the busiest shipping lane in the world, this route contains one of the world's rare rivers - a chalk stream flowing through the heart of Dover. Kate's walk begins above Folkestone Harbour at Martello Tower 3, built in the early 19th century to defend against a naval invasion by Napoleon.