Calla Bryn Sturgis serves as the main setting for Wolves of the Calla.
The people of Calla Bryn Sturgis are almost all either farmers or ranchers, the wealthiest of them being Wayne Overholser. They grew rice and wheat, and raised cattle and sheep.
On rare but consistant occasions (about every three decades), the Wolves would come to Calla Bryn Sturgis and take one child from each pair of twins. They would extract the brain matter of the children and feed it to the Breakers so that they could continue their work. The children would be returned as "roont," or ruined, and could no longer function as normal human beings. This was put to a stop when Roland Deschain and his Ka-tet, along with many citizens of the Calla, defeated the Wolves.