The White Cliffs of Dover are located in Dover, Kent, England, on the southeastern coast of the country. They are a dramatic landmark and a symbol of Britain.

They are white because they are primarily made of chalk, a soft, white, porous rock formed from the fossilized remains of tiny marine organisms called coccolithophores. These organisms have a chalky shell, and over millions of years, their shells accumulated on the seabed, eventually forming the chalk cliffs.

The white color is further enhanced by the presence of quartz crystals, which are also present in the chalk. These crystals reflect light effectively, contributing to the bright white appearance of the cliffs.