From the BBC again:
South China Karst The diversity of South China's karst features - a unique landscape formed by water eroding limestone and marble rocks - are said to be unrivalled.
The karst towers of Libo are described as being among the finest examples of this kind of formation.
The karst towers of Libo are described as being among the finest examples of this kind of formation.
Jeju Volcanic Island Situated off the southern shores of South Korea, the island also features a network of lava tubes.
The IUCN describes the system as the "most impressive and significant series of protected lava tube caves in the world".
The IUCN describes the system as the "most impressive and significant series of protected lava tube caves in the world".
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