
Thermokarst is a land surface characterised by very irregular surfaces of marshy hollows and small hummocks formed as ice-rich permafrost thaws, that occurs in Arctic areas, and on a smaller scale in mountainous areas such as the Himalayas and the Swiss Alps. These pitted surfaces resemble those formed by solution in some karst areas of limestone,...
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http://en.wikipedia.org/wiki/Thermokarst

land-surface configuration that results from the melting of ground ice in a region underlain by permafrost. In areas that have appreciable amounts of ... [1 related articles]
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http://www.britannica.com/eb/a-z/t/37

Landscape dominated by depressions, pits, and caves that is created by the thawing of ground ice in high latitude locations. Resembles karst landscape but is not created by chemical weathering.
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http://www.physicalgeography.net/physgeoglos/t.html

Land surface in Arctic areas characterised by very irregular surfaces of marshy hollows and small mounds formed when ice-rich permafrost thaws.
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http://www.scientificpsychic.com/etc/geology-glossary.html

thermokarst An area in a permafrost region characterized by an irregular land surface as a result of the melting of ground ice.
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http://www.wordinfo.info/words/index/info/view_unit/4265/22

the process by which characteristic landforms result from the thawing of ice-rich permafrost or the melting of massive ice.
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https://nsidc.org/cryosphere/glossary?page=26
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