“I hear this place is home to Macedon's great wyverns. But since the area is overrun with barbarians, even the Macedonian soldiers dare not set foot in here.”
The Wyvern's Dale is located precisely on the border of Macedon and Dolhr, and is an uncivilized land populated by wyverns and barbarians. It surrounds the Dragon's Table, forcing Marth's party to pass through here in order to enter the Table, defeat Gharnef and Medeus, and save the four missing clerics.
While in the area, Marth encounters Michalis, who is gravely wounded from a battle with Gharnef after stealing the Starlight tome for Marth. In Mystery of the Emblem, Michalis succumbs to his wounds, but in Shin Monshō no Nazo, he can survive if Minerva speaks to him first.