The White Walls of Castanor is one of Balgar's Wonders and were a set of large fortifications that protected and formed the borders of Inner Castanor region. The wall is known to for its immense size that was unseen beyond the dwarven holds at the time, while it did protect the fledgling Castanor from the dangers of the fey and hostile human tribes, it primarily served as a testament to Castanor's power and role as leaders of humanity during that period.
As the walls were widely impractical it was only properly maintained during Greater Castan's Empire. By the time of Black Castanor in the 9th century much of it had fallen to disrepair - regardless, due to its dwarven make it was still an incredibly formidable fortification, and was instead sparsely manned by an order known as the Wardens of the White Wall. By the Greentide, however, the order had become the royal rangers who looked after the royal woodland for the Castellyrian king in addition to their traditional duties.