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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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The Royal Military Canal Path (27 miles) mainly follows a canal-side path, which fringes the northern edge of Romney Marsh and which was built in the early 19th century as a defence against a possible invasion by Napoleon. The Canal is a Scheduled Ancient Monument and a SSSI. In addition to its historical and archaeological interest it is a valuable wetland habitat for a variety of species of flora and fauna. Links are made with the Saxon Shore Way at Appledore and West Hythe providing options for a circular route between these two places.