Cardassia Prime
From FEInfobase
The formal name of the Cardassian homeworld -- a world other than the third, fourth or fifth planet of the system -- although natives often informally drop the "Prime."
It is the seat of power for the Cardassian Union and home to the Cardassian people.
Its capital city is awash with giant and continuous state-controlled messages extolling self-sacrifice, order, and subservience to the government -- with a characteristic emphasis on the family and children. The central prison is located there.