Abstract: A containment system has a plurality of concrete blocks. The concrete blocks each have sides, ends, a top surface, a bottom surface, a male interlocking element extending from one of the ends, and a female interlocking element formed in the other of the ends, and/or one of the sides. The plurality of concrete blocks may be interlocked together to form a containment perimeter. A security fencing structure may be operably mounted on top of the concrete blocks of the containment system.