Corpigras is an ancient underground city located underneath Djornt, south of the Great Elder Ridge and west of the Grimleaf Forest. There are a handful of mechanical elevator shafts out in the middle of some grassy fields which lead down to the outer edges of the city. The city center is occupied by Yekek. On the outskirts of Corpigras are tribal camps of conics and Tzatti, in a marshy subterranean swamp. The Corpigras Cavern is quite gigantic. There are mined and natural tunnels which twist and turn up into the Great Elder Ridge, but they are difficult to navigate. There is also a mighty underground river called Tiruthga which leads to the ocean. A subspecies of sea tree, the Tiruthga Sea Tree, has evolved to grow in the underground environment.