Spine of the World

In the fictional setting of the Forgotten Realms, the Spine of the World is the range of mountains north of the Silver Marches where Bruenor Battlehammer's home is. It is said to be almost impossible to cross, teaming with ogres, orcs, and other foul creatures of the north. Bards say that if you do manage to cross it, you come to an endless sea of mist and ice, in which white dragons (the least intelligent of true dragons) wait to consume anything that comes their way.