Abstract: Protecting systems for coasts, breakwaters, slopes, dikes, sand dunes and similar, and more particular improvements in self-locking blocks forming component elements of protection structures against erosion, to the process of assembling said structure, as well as the resulting structure. The purpose is to afford a structure adapted to counteract the destructive and erosive action of external physical phenomena, such as wing, water, and the like, with respect to coasts, slopes, breakwaters, dikes and sand dunes.