Abstract: A method and means are provided for stopping erosion of beach areas and restoring the same by wave and wind activated formation of new dunes, by erecting on the beach area an elongate frame and screen structure of lightweight materials and anchoring said structure to the ground. The frame members are arranged and interconnected to form a plurality of tetrahedral units which, in turn, are assembled so as to present to incoming waves a zigzag-shaped wall composed of screen sections inclined upwards and landwards, whereby to subject the structure to forces tending to press it down towards the ground and thus to retain it in position even before it is buried in accumulating sand masses. The invention includes special means for interconnecting the frame members and for anchoring the structure.