Spine of the World

The Spine of the World is a mountain range stretching from the westernmost part of Faerûn south of Icewind Dale to the eastern edge of the Cold Wood where it joins up with the Ice Mountains, which stretch all the way to the Anauroch.

Description
Folks all across the lands of the Savage Frontier and the Silver Marches, but especially those in Scornubel refer to the Spine as 'the Wall', typically because it's simply an endless, nearly impassable range of high, jagged, perpetually ice-covered mountains, but also because on the winter days when the white snow covered faces of the peaks meet the iron-grey of the sunless winter sky, it appears as though it is holding up sky.

While the western-most edge of the Spine is penetrated by a circuitous, always dangerous trade route to Icewind Dale, the rest of the range is not even approached by those without a stout heart. Those creatures that do inhabit the Spine are not spoken of in polite company, and their propensity to raid the lands below keeps the conifer-cloaked, stag-roamed rolling foothills relatively uninhabited (as though the Savage Frontier and the Silver Marches were packed) - but it should come as no surprise that several fierce barbarian tribes inhabit these lands, traveling between summer and winter camps.

Some of the mountains in this range stand over 20,000 feet tall, and all but the smallest are covered in snow and ice at all times.