It is a spectacular group of white cliffs in the Dover area of Kent, England, mainly composed of chalk, hence the name "White Cliffs". Towering above the English Channel, it is one of the most famous natural landmarks in the UK and a symbol of the country. The formation can be traced back to the Cretaceous period, about 100 million years ago, when the Cretaceous layer was deposited from the remains of marine organisms. These sediments gradually hardened under the pressure of geological strata, forming the Cretaceous rocks we see today. The height of the white cliffs can reach 350 feet, and on clear days, they stand out particularly on the sea surface. Not only is it a natural beauty, but it is also an important geological and archaeological site.