While we're clarifying, headcanon is the Shattered Mountains stretch more or less down the western coast of the continent, cut off from the sea by high cliffs in all but a few areas, and primarily accessing the rest of the continent via the Twin Streams river as it flows out of the mountain range towards a lake near the Capital (Before further flowing towards the sea). There are many smaller passes dotting the range, eventually leading to the pockets of farmland that the main factions have cultivated, but they are much harder to access in any season except Summer. 

Its main exports are metals, gemstones, mercenaries, and timber- especially Ironwood. I would imagine they are the main source of new gold and silver for coinage in the Kingdom- Especially after those desert bluebloods hoarded all of the old supply and made a damn castle out of it.