The Ryongmun cavern, situated in Kujang County, North Pyongan Province.
Formed 480 million years ago by limestone erosion, the cavern consists of two large grottos and some 30 branches, and 15 scenic sectors whose names are derived from the names of bumper harvest, frostworks, flowers of all shapes, a twisting dragon, mushroom, jewels, brothers, all nature and so on.