The Seven Sisters are a series of chalk

Chalk

Chalk is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. Calcite is calcium carbonate or CaCO3. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite plates shed from micro-organisms called coccolithophores....

 cliff

Cliff

In geography and geology, a cliff is a significant vertical, or near vertical, rock exposure. Cliffs are formed as erosion landforms due to the processes of erosion and weathering that produce them. Cliffs are common on coasts, in mountainous areas, escarpments and along rivers. Cliffs are usually...

s by the English Channel

English Channel

The English Channel , often referred to simply as the Channel, is an arm of the Atlantic Ocean that separates southern England from northern France, and joins the North Sea to the Atlantic. It is about long and varies in width from at its widest to in the Strait of Dover...

. They form part of the South Downs

South Downs

The South Downs is a range of chalk hills that extends for about across the south-eastern coastal counties of England from the Itchen Valley of Hampshire in the west to Beachy Head, near Eastbourne, East Sussex, in the east. It is bounded on its northern side by a steep escarpment, from whose...

 in East Sussex

East Sussex

East Sussex is a county in South East England. It is bordered by the counties of Kent, Surrey and West Sussex, and to the south by the English Channel.-History:...

, between the towns of Seaford

Seaford, East Sussex

Seaford is a coastal town in the county of East Sussex, on the south coast of England. Lying east of Newhaven and Brighton and west of Eastbourne, it is the largest town in Lewes district, with a population of about 23,000....

 and Eastbourne

Eastbourne

Eastbourne is a large town and borough in East Sussex, on the south coast of England between Brighton and Hastings. The town is situated at the eastern end of the chalk South Downs alongside the high cliff at Beachy Head...

 in southern England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

. They are within the Seven Sisters Country Park. They are the remnants of dry valley

Dry valley

A dry valley is a valley found in either karst or chalk terrain that no longer has a surface flow of water.There are many examples of the latter along the North and South Downs in southern England...

s in the chalk South Downs, which are gradually being eroded by the sea.

The Seven Sisters cliffs are occasionally used in filmmaking

Filmmaking

Filmmaking is the process of making a film, from an initial story, idea, or commission, through scriptwriting, casting, shooting, directing, editing, and screening the finished product before an audience that may result in a theatrical release or television program...

 and television production as a stand-in for the more famous white cliffs of Dover

White cliffs of Dover

The White Cliffs of Dover are cliffs which form part of the British coastline facing the Strait of Dover and France. The cliffs are part of the North Downs formation. The cliff face, which reaches up to , owes its striking façade to its composition of chalk accentuated by streaks of black flint...

, since they are relatively free of anachronistic

Anachronism

An anachronism—from the Greek ανά and χρόνος — is an inconsistency in some chronological arrangement, especially a chronological misplacing of persons, events, objects, or customs in regard to each other...

 modern development.