A Dominion prison camp in the Gamma Quadrant where Martok, Garak, Worf, Enabran Tain and the real Julian Bashir are held.
Internment Camp 371 is a Dominion detention center on a Gamma Quadrant asteroid. Worf and Garak are taken there in In Purgatory's Shadow and find the dying Enabran Tain, the Klingon general Martok and the real Julian Bashir, revealing that a Changeling has replaced Bashir on the station.
In By Inferno's Light, Worf survives a long run of fights against Jem'Hadar guards while a claustrophobic Garak works inside the walls to finish a transmitter. The prisoners are beamed away just before Worf's execution.