Wastelands

The wastelands are a part of Sachaka which are located to the south, and are mostly inhospitable.

Many attempts have been made by Sachakan magicians to try and give the land life again so that it may be used for better purpose, however all attempts have been unsuccessful. No-one is completely sure where they have come from.

Ichani are banished by the Sachakan King to the wastelands.

Spoilers from "The Magician's Apprentice"
In The Magician's Apprentice we learn that it is Lord Narvelan who creates the wasteland by releasing the magic from a storestone.

Spoilers from "The High Lord"
Akkarin and Sonea are exiled to the wastelands in The High Lord and they manage to survive mostly through the use of magic.

Spoilers from "The Traitor Queen"
When Sonea and Regin come to the wastelands, Sonea notices that the Traitors hid higher magic stones there, which take all the life from the land in the wasteland as it tries to repair itself, to prevent the regeneration of nature.