noun. An area of irregular limestone in which erosion has produced fissures, sinkholes, underground streams, and caverns.

noun. A type of land formation, usually with many caves formed through the dissolving of limestone by underground drainage.

"The base, nested in karst on the southern edge of the Plain of Jars, was the headquarters for the CIA-funded Meo army commanded by General Vang Pao."

karstology  thermokarst  

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