Laying on the southern edge of Hurins Landing, roughly a quarter mile from the forests edge is The Cave.
The Cave serves as a jailhouse for the small port community. It is not conducive to long stays, most prisoners are rowdy locals or sailors who are thrown overnight, other more serious crimes are usually handled through swift frontier justice.
The Cave is exactly what it sounds like, a large hill with a cave beneath it. The front is covered with a massive iron cage door set into the stone base of the hill, that swings outward.
The commander of the watch carries the keys on his person when on duty, when not on duty they remain in his room at the boardinghouse, hidden safely away.