The Ancient Chronicles of Jol Ta Rog: The Rising
This region has been named Ashenvale because when Fato tried to become more powerful he cast a spell that made a meteorite crash into this region and left a crater full with ash.
After Fato died a group of wizards did a great ritual to create a region full with life. It became a great place with a lot of green, hills, mountains and forests. It is a big part of the world now, there are a lot of cities here.