The Abisko-Torneträsk area in northern Sweden contains several cave systems developed on carbonate stata of the Caledonidenappes.
Switzerland
7,900 square kilometres (3,100 sq mi), or 19% of the surface of Switzerland, is karst, within this area lies the majority of the 7,500 currently known Swiss caves, with an accumulated passage length of more than 1,200 kilometres (750 mi)[citation needed].
Ukraine
Podolia and Bukovina regions in the northeastern edge of the Carpathian Mountains which includes some of the largest gypsum caves in the world, including the Optymistychna Cave, which is over 200,000 meters in length, making it the longest cave in Eurasia, the third longest in the world, and the longest gypsum cave in the world.[citation needed]
^"giants+hole"+castleton&as_brr=3#PPA63,M1 Castleton, Karst hydrology By Christian Leibundgut, John Gunn, Alain Dassargues, International Association of Hydrological Sciences, 1998, ISBN 1901502406, accessed June 2009.
