Miss. Code Ann. § 47-5-3

The plantation known as Parchman owned by the state in Sunflower and Quitman Counties, and in such other places as are now or may be hereafter owned or operated by the state for correctional purposes shall constitute the facilities of the correctional system for the custody, punishment, confinement at hard labor and reformation of all persons convicted of felony in the courts of the state and sentenced to the custody of the department, and whenever the term “penitentiary” or “state penitentiary” appears in the laws of the State of Mississippi, it shall mean any facility under the jurisdiction of the Department of Corrections which is used for the purposes described herein.