Coral Cave
Appearance
The Coral Cave (Swedish: Korallgrottan) is a marble cave at the northernmost tip of Jämtland, near Ankarvattnet, Sweden. It was discovered in 1985. So far, six kilometres of it have been explored, making it Sweden's longest cave.[1][2] Members of the public are not allowed to visit the Coral Cave without a guide.
References
64°52′N 14°06′E / 64.867°N 14.100°E