A common shorthand for Calla Bryn Sturgis and the surrounding borderland communities. The Callas are farming regions in the borderlands between Mid-World and End-World, known for producing rice and other crops. The people of the Callas live under the periodic terror of the Wolves, who come from Thunderclap each generation to steal one child from every pair of twins. The stolen children are returned roont - physically grown but mentally ruined - their brain chemicals having been extracted to feed the Breakers.