Longest Caves of Finland


Finland is dominated by a crystalline craton, and while it has several underground sites, most are mines or subterranea. Nevertheless, there are also about a thousand caves, but as they are erosional and tectonic caves, due to the lack of limestone areas, the caves a quite small. Bob Gulden’s list of longest caves lists only caves longer than 10 km, not a single cave from Finland is listed. There is only one caving club in Finland, and they do not maintain such a list. So we decided to fill this gap and list a few caves of Finland. We are not officially managing this list, but we do our best.

The main problem with this list is the fact that most caves are boulder caves, and it is quite difficult to determine which section belong to the same cave and which are separate caves. The classical definition says there must be an underground connection big enough for a caver. But the boulders often have gaps, and so there are 20 cm or probably half a meter without a roof, and strictly speaking this would be two separate caves. We think a little flexibility is necessary and listed the version where all parts are considered the same cave. Another problem is the fact that many caves are not surveyed at all, and all given numbers are estimates.


Name Location Coordinates Län Length Type Comment
Lohikäärmeen Luola
Dragon’s Cave		 Siuntio, Korkberget, Kirkkonummi 60.162020, 24.162020 RegionSouthern Finland Province 300 m SpeleologyNeotectonic Cave The longest cave of Finland is a maze of cracks and small chambers with numerous entrances. The nickname Dragons Cave is because of the form of the 3D model which resembles a four-legged dragon.
Repouuro luola Koli National Park, Ukko-Koli hill 63.094390, 29.808864 RegionEastern Finland Province 280 m SpeleologyNeotectonic Cave the boulders around the hilltop are full of crevices and chambers with numerous entrances, chambers, crevices, no way to find the whole cave without a survey
Toskaljärven luola Käsivarsi Wilderness Area, Kilpisjärvi 69.197497, 21.440461 RegionLapland Region 106 m SpeleologyKarst Cave Located in the arm of Lappland, near Lake Toskaljärvi, 3 days hiking from next road. Wrongly called the second-longest cave of Finland. River cave, through cave. Never surveyed, the length is the distance between the entrances as the crow flies, the actual length is estimated 150 m.
Torhola luola Karkalintie 773, 08100 Lohja 60.252407, 23.857225 RegionSouthern Finland Province 107 m SpeleologyKarst Cave Finland’s longest passable karst cave.
Repokallio luola Kolin, Repovaara 62.961005, 31.279713 RegionEastern Finland Province 82 m SpeleologyNeotectonic Cave 9 entrances, chambers and tight passages
Olhavanlammen luolat
Olhavanvuoren luola		 Aarnikotka Forest Nature Reserve, Valkeala 61.185928, 26.838156 RegionSouthern Finland Province 78 m SpeleologyNeotectonic Cave located in the western end of Olhavanvuori hill above lake Olhavanlampi, hence the two names. Requires SRT equipment.
Purnunlouhe luola Nurmes 63.454184, 29.071384 RegionEastern Finland Province 50-100 m
(estimated)		 SpeleologyNeotectonic Cave spacious chambers, used as a hideout by the Lapps during the Rappasotie.
CavePirunkirkko Koli National Park, Rantatie 63.044175, 29.918299 RegionEastern Finland Province 33 m SpeleologyNeotectonic Cave a maze of different gaps between boulders, the length is disputable as it is hard to determine if this is one cave or several separate caves
CaveLullinvuori Luola Muuratsalo island, Säynätsalo 62.0897202, 25.7581639 RegionWestern Finland Province 32 m SpeleologyNeotectonic Cave