<P> Coordinates: 51 ° 08 ′ N 1 ° 22 ′ E ﻿ / ﻿ 51.14 ° N 1.37 ° E ﻿ / 51.14; 1.37 </P> <P> The White Cliffs of Dover are cliffs that form part of the English coastline facing the Strait of Dover and France . The cliffs are part of the North Downs formation . The cliff face, which reaches up to 350 feet (110 m), owes its striking appearance to its composition of chalk accented by streaks of black flint . The cliffs stretch along the coastline for eight miles (13 km), spreading east and west from the town of Dover in Kent, and part of them were purchased by the National Trust in 2016 . They are part of the Dover to Kingsdown Cliffs Site of Special Scientific Interest and Special Area of Conservation </P> <P> The cliffs are located along the coastline of England between approximately 51 ° 06 ′ N 1 ° 14 ′ E ﻿ / ﻿ 51.100 ° N 1.233 ° E ﻿ / 51.100; 1.233 and 51 ° 12 ′ N 1 ° 24 ′ E ﻿ / ﻿ 51.200 ° N 1.400 ° E ﻿ / 51.200; 1.400.It marks the point where Great Britain most closely approaches continental Europe and on a clear day the cliffs are easily visible from the French coast . The chalk cliffs of the Alabaster Coast of Normandy, France, are part of the same geological system as Dover's cliffs . </P>

What type of sediments are the white cliffs of dover made of