The Slab Games Gears of War 3 Default Weapons Incendiary Grenade Frag Grenade Smoke Grenade Ink Grenade Boomshot Digger Boltok Pistol Gorgon Pistol Location Jacinto Maximum Security Prison Terrain Urban

"Convicted for insubordination and treason, Marcus was incarcerated in Jacinto Maximum Security Prison. Known as “The Slab”, this prison is not a correctional facility – it’s a place where Sera’s worst offenders are locked up and forgotten. The inmates are brutal, parole is not an option, and the average life expectancy is about two years. But that was before the Locust showed up, and what couldn’t get worse, suddenly did. Now your life expectancy there is around 2 minutes."

— Official description of The Slab

The Slab is a map added in the Fenix Rising DLC for Gears of War 3. It is based on the Jacinto Maximum Security Prison. There is an easter egg on the map which involves some events from Gears of War, but none have came close to solving it so far