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The Royal Military Canal stretches for 28 miles hugging the old cliff line that borders the Romney Marsh from Hythe in the north east to Cliff End in the south west. It was built as a third line of defence against Napoleon, after the British Royal Navy patrolling the English Channel and the line of 74 Martello Towers built along the south coast. The Royal Military Canal was constructed in two sections. The longest section starts at Hythe in Kent and ends at Iden Lock in East Sussex. The second smaller section runs from the foot of Winchelsea Hill to Cliff End. Both sections are linked by the Rivers Rother and Brede.

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National Route 2 will link Dover with St. Austell when complete via the south coast of England and is sometimes referred to as the South Coast Cycle Route.
The route is only fully open, at present, and signed between Dover and Brighton, but is still under development between Brighton and St. Austell.