Maximum security prisons and supermax prisons are grades of high security level used by

prison A prison, also known as a jail, gaol, penitentiary, detention center, correction center, correctional facility, or remand center, is a facility where Prisoner, people are Imprisonment, imprisoned under the authority of the State (polity), state ...

systems in various countries, which pose a higher level of security to prevent prisoners from escaping and/or doing harm to other inmates or security guards. *For the United States, see Incarceration in the United States § Security levels *For Canada, see Correctional Service of Canada § Security classification of offenders *For other prison systems, see Prison § Security levels

See also