The Epednan Expanse is the Ynn's westernmost region, spanning vertically in-between Dolindha and Sarda's western reaches and the Ekyunimoy Mountains.
Despite being classified as part of the Ynn River Valley, only the northern half of the Epednan Expanse houses tributaries to the Ynn River. The southern half of the Expanse is marked by the Lady Isobel and Passing River. The Expanse is often conflated with the Ynnic Western-Lands, with the two terms being used interchangeably by most.
The name Epednan Expanse is derived from "Epednar", which is actually an exonym given to them by Dolindhan Ruinborn meaning "People of the West". Despite this, the first Ruinborn to settle the Epednan Expanse were actually the Sarda.
The great flatlands of the Expanse promote a nomadic lifestyle. The Epednar were traditionally a thorn in the side of the Ynnic Empire, which didn't manage to sudue them even at its apex during the Lovdrakan. Even in modern times, the communities established in the region rely mostly on ranching. Cannorian settlers of the Expanse are known as cowboys, with many of them attracted by rumors of gold in the Ekyunimoy mountains.