Namikaze Prison

Namikaze Prison (波風刑務所,Namikaze keimusho) is a heavy fortified prison built outside the country surrounded by nothing but ocean. the namikaze is a prison made for crimals that defect from other villages or their own, they simply restrict the inmates chakra and keep them from venturing outside keeping them inside the prison with a large area for them to walk around.

The inmates are force into hard labor where they're to dig out metal, gems and other materials etc.