The Fendur Mountains are a mountain-range separating the lands of Fenrunr from the rest of Mogxa, which has historically established a rather firm and uncontested border. The exception remains in the south, where the mountains give way for the Reivlands.
The Fendur Mountains are hard to pass besides a few passes, along which many have Mountain Holds built by the Dwarves. The Greyhold in the north is one such example, which is still used to traverse between Fenrunr and the Northern Mogxan Shore. Another is the harder-to-reach and abandoned Blackwall.
Other smaller tunnels and tunnel-like openings through the mountains exist, which during a certain hour of the day visibly shines light through from the sun to the other side - creating a beam of light fascinating to visitors.