Karst landscape near Minerve, France Limestone, a type of sedimentary rock, consists of the remains of tiny sea creatures that lived millions of years ago. It is made of calcium carbonate, a substance that dissolves easily in water. Because of this, limestone landscapes, also known as karst topography (from the landscape around the Kras Plateau in Slovenia), have a number of distinctive features. These include caves, pavements, swallow holes and dry valleys.
Natural cracks or joints in the limestone criss-cross the surface. These are gradually widened by water dissolving the rock to form a limestone pavement. The raised lumps are called clints, and the eroded cracks are called grykes.
Highly eroded karst landscapes in which steep-sided hills are set in flat river floodplains are called tower karst and are a famous feature of the Guilin area in south China.
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