Vorian Knot

The Vorian Knot is a geographical feature in central Tholomyra where the main ranges of the Adhemars, Dramengars, Helgremars, and Alimdars converge in an imposing mass of extremely tall, permanently snow-covered mountain peaks. These peaks are among the most majestic, and inaccessible, in the world. It is also known to nearby human populations as the Roof of the World or the Pillar of Heaven due to its immense height; folktales in the region say that its summits touch the sky and hold up the firmament above Urva, and that from its pinnacle rises a bridge that pierces heaven’s vault and runs to the gate of Aenuvion. 
Such tales are scoffed at by the actual inhabitants of the Vorian Knot, who are the dwarves of Kuzul-Kadrin. The Knot's central group of peaks are called the Dhurgunvili or Nine Crowns, which truly are the highest in the world, and beneath them lies the gigantic underground city of Kuzulnizam: capital of Kuzul-Kadrin, seat of its High King, the greatest stronghold in dwarfdom and therefore probably in all of Urva. Thus the Vorian Knot and the Dhurgunvili in particular are both the symbolic and political heart of Kuzul-Kadrin, as well as its geographic center in that all the major mountain ranges of the kingdom converge there. 
The Vorian Knot takes its name from the semi-mythical dwarven hero Voro Trollhammer, who supposedly had a hand in the founding of what would become Kuzulnizam millennia ago.