Labyrinth of Lost Souls

The Labyrinth of Lost Souls is a location seen in the Comic, The Ice Castle, and is located in the Northlands.

Geography
Based on the commentary of Arngrim Dammen, the Labyrinth of Lost Souls is located adjacent to the Ice Needles on the coastline and the volcano, Utgard-Loki. Presumably, they are a complex network of caves around or under Utgard-Loki. They also connect to the Jotun Hot Springs.

The Ice Castle
Arngrim Dammen mentions the Labyrinth of Lost Souls when boasting about his escapades to the Hairy Hooligans.