Cliff is a steep, high rock face that rises sharply from the land or water below. Cliffs can be found along coastlines, mountains, or valleys. They often have vertical or near-vertical surfaces. Some cliffs are made of layers of rock, while others are solid stone.

Cliffs are found worldwide, including sea cliffs along oceans and inland cliffs in mountain regions. They formed over long periods of time through natural processes. Cliffs can be habitats for plants and animals, such as birds that nest on high ledges. Some cliffs are also visited by people for climbing or viewing landscapes.