Kanodang is a prison that's located in Rajmuat, the capital city of the Copper Isles. It houses anyone from murderers, rapists, traitors, and the like. It also housed anyone who did not support the Rittevon family.
Imajane Rittevon, the princess regent, threw Vurquan Nomru, a wealthy and powerful duke, in the prison when he told her that she was being foolish.