The lummelund cave is one of our country’s longest caves – the total length of the parts so far explored amounts to almost 4 km. However, there is still much to be found. 

The cave is a so-called karst cave, which has been formed by the fact that water via narrow cracks has penetrated into the limestone bedrock. Where the surface water has met the groundwater, the water has begun to dissolve the lime, and gradually longer and further underground aisles have been created.

The cave can be said to consist of two parts: a water-bearing, active part and a now-dry part, the so-called fossil system. The water that flows through the active part of the cave comes from a buried channel through the now elaborate Martebo marsh. At the bottom of the canal are several so-called drain holes, where the water disappears into the ground and then, on so far unknown paths, look for the cave. Especially in the fossil system, but also in other parts of the cave, there are a lot of beautiful drop stone formations of various kinds. The inner parts of the cave have a relatively constant climate with an air temperature of 4-8 ° C and a relative humidity of 95-100%.

Most of the cave has probably been formed before the last ice age. The mouth part of the cave, the so-called Linné’s cave, has been known for a long time and is mentioned among other things. by Linnaeus from his journey on Gotland in the summer of 1741. Before Martebo myr, once Gotland’s largest marsh complex, was thrown out in the late 1800s, the water flow out of the cave’s mouth at Lummelund’s mill was considerably more powerful than it is today, and in 1620 the number led to the water. operate up to six water mills simultaneously. 

However, the inner part of the cave was first discovered in 1954 by three young people. In 1959, a tunnel was erected that made the inner parts easily accessible to visitors, and today the cave is a major tourist attraction. 
(Source: County Administrative Board on Gotland)


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