The Enolian penal world to which Archer and Tucker are sent after being mistaken for smugglers.
Canamar is a prison planet run by the Enolians. In Canamar, Archer and Tucker are arrested as smugglers and put aboard a transport carrying convicts there, while T'Pol tries to win their release through the Enolian authorities.
The prisoners never reach Canamar. The convict Kuroda seizes the transport on the way, and Archer ends up piloting it while Enterprise tracks it down. Canamar is shown only in name, but its reputation shapes the desperation of the prisoners aboard.