Ducos is a town and commune in the French overseas department and region, and island of Martinique. It is where the prison is located.
It was called "Trou-au-chat" until 1855, and was renamed after the French politician Théodore Ducos. Its inhabitants are Ducossais.
Wikipedia https://en.wikipedia.org/wiki/Ducos,_Martinique
Coordinates 14°34'27.569" N -60°58'18.843" E