Yazuac was one of the many villages obliterated by the Empire during the Northern Massacres. It was completely wiped out by Urgals, held under control of the Empire by the Shade Durza. What made Eragon most angry was the baby on top of the pile of the dead, an Urgal spear embedded in its side. A raven made to eat the baby, but Eragon stopped it by shooting it with his bow. It was also this anger that allowed him to first use magic.
It was populated by around two hundred people at its peak, and was bordered by the Ninor River.