刑務所の

of the prison

→ 刑務所
phrase Rare #39,019
of the prison の connects 刑務所 (prison) to a following noun, showing possession or association.
JA: 刑務所の門は閉まっています。
EN: The prison gate is closed.

囚人は刑務所の塀の下に穴を掘った。

The prisoner dug a hole under the prison wall.

刑務所の秩序は無事回復されました

Order in the prison has been successfully restored.

— es[エス] (2001)

皆さん皆さんは刑務所の看守です

Everyone, you are prison guards.

— es[エス] (2001)