Belle Reve Correctional was an American prison.
Background information Edit
In the comics, Belle Reve (French for "Good Dream") is a metahuman prison in Terrebonne Parish, Louisiana. Waller recruits her Suicide Squad members there.
In the DCAU, the location of Belle Reve is never revealed. Louisiana does not use the gas chamber as a means of execution, though this discrepancy can be ascribed to a Californian writer (similar to Superman: The Animated Series, "The Late Mr. Kent").