The Roughs are an escarpment

Escarpment

An escarpment is a steep slope or long cliff that occurs from erosion or faulting and separates two relatively level areas of differing elevations.-Description and variants:...

 of the North Downs

North Downs

The North Downs are a ridge of chalk hills in south east England that stretch from Farnham in Surrey to the White Cliffs of Dover in Kent. The North Downs lie within two Areas of Outstanding Natural Beauty , the Surrey Hills and the Kent Downs...

 above Romney Marsh

Romney Marsh

Romney Marsh is a sparsely populated wetland area in the counties of Kent and East Sussex in the south-east of England. It covers about 100 mi ² .-Quotations:*“As Egypt was the gift of the Nile, this level tract .....

 in Kent

Kent

Kent is a county in southeast England, and is one of the home counties. It borders East Sussex, Surrey and Greater London and has a defined boundary with Essex in the middle of the Thames Estuary. The ceremonial county boundaries of Kent include the shire county of Kent and the unitary borough of...

, on the south coast of England. The term is generally applied to the section between Hythe

Hythe, Kent

Hythe , is a small coastal market town on the edge of Romney Marsh, in the District of Shepway on the south coast of Kent. The word Hythe or Hithe is an Old English word meaning Haven or Landing Place....

 and West Hythe

West Hythe

West Hythe is a hamlet near Hythe in Kent, England. Modern settlement is mostly on the plain south of the Royal Military Canal, but the ancient church of St Mary's stands in ruins at the foot of the escarpment north of the canal....

 but the structure extends as far west as Bilsington

Bilsington

Bilsington is a village and civil parish in the Ashford district of Kent, England. The village is south of Ashford, on the B2067, Hamstreet to Hythe road just north of the Royal Military Canal...

, and the highest point is 106 m just west of Port Lympne

A concrete sound disk (or Sound mirror) has been built in the hillside. This was used to listen out for approaching aircraft during World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

.