Abstract: The embankment element serves to stabilize a slope. A box element has at least one lateral cultivation surface which is provided with a material layer which promotes the growth of plants. The factory-produced embankment element may be brought to the building site, if need be in an already cultivated state. It comprises a prismatic body (10) having at leat one self-supporting side wall (2). The further side walls (3, 4) are formed by a load-bearing single-piece mat (8) which is provided with through-passages (7) and also encloses the self-supporting side wall (2). The self-supporting side wall (2) and the other side walls (3, 4) enclose, with the interposition of said mat (6), a core (9) consisting of a humus-like composition. The end parts of the mat (8) are connected to one another and may be suspended on a bearing element (12).