<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>
what type of sediments are the white cliffs of dover made of
chalk accented by streaks of black flint