correctional facility
A facility for the rehabilitation or correction of offenders, such as a juvenile reformatory or a prison with a focus on rehabilitation.
He underwent a rehabilitation program at a correctional facility.
刑務所 is a prison for convicted criminals, while 更正施設 emphasizes rehabilitation and may include facilities for juveniles or those with less severe offenses.
少年院 is a juvenile reformatory specifically for young offenders, a type of 更正施設.
Compound of 更正 (correction, rehabilitation) and 施設 (facility, institution).