An apparatus and method for stabilizing sloped embankments is disclosed which utilizes interlocking barrier elements to form a step-like, cascading barrier to erosion and to provide an inexpensive, easy-to-install and aesthetically attractive landscaping wall, planter or landscaping island. The scallop or channel-like shape of the barrier elements creates filler spaces which may be filled with concrete, soil or other filler materials and in which vegetation may be planted. Each row of barrier elements within the system is locked in place by slip restraint devices which function to prevent vertical slippage of the rows. Adjacent barrier elements on the front most row are held together by frontal locking elements.