Barbed wire security prison fence

Prison fence is a barrier typically made of metal or wire that surrounds a prison or correctional facility. Its purpose is to prevent inmates from escaping and to provide security for the facility. 

Prison fences are usually tall and topped with barbed wire or other deterrents to discourage climbing or scaling. They are designed to be difficult to breach and are often equipped with surveillance cameras and other security measures to monitor inmate activity and prevent unauthorized access.