karst
Concise Oxford English Dictionary © 2008 Oxford University Press:
karst /kɑːst/
▶noun Geology landscape which is underlain by limestone which has been eroded by dissolution, producing towers, fissures, sinkholes, etc.
– derivatives
karstic adjective.
karstic adjective.
– origin C19: from Ger. Karst, the name of a limestone region in Slovenia.
'karst' also found in these Oxford entries:

