On the steep southern side of the Cape Karkalinniemi, there is the largest cave in Finland. The cave is about 30 metres long in total and there are several cavities to be explored. Most part of the Torhola cave has been formed by the melting water after the last Ice Age. Because of the chalkyness of the rock foundation, there are several valuable rock and herb-rich forest areas. The rocky hill is rich in nutrients, and the shadowy cliffs also offer exellent conditions for many other demanding plants.
There is a marked nature path of approximately one kilometre that takes you from the Torhola cave to the fine common alder grove by the lake. Along the path, you can get acquainted with both of the rare elm species growing in Finland, the fluttering elm and the mountain elm, as well as the amazing common lindens that were used to make ropes for sailing ships.