Positive interlocking revetment blocks adapted for providing a matrix having one or more linear borders. Disclosed are border blocks that each have one side without an interlocking arm or socket, thus providing part of a linear side of the matrix. Disclosed also are corner blocks that each have two sides without an interlocking arm or socket, thus providing part of linear sides to the matrix. Interior interlocking blocks are constructed for interlocking with the border blocks and the corner blocks, and with each other to form a matrix that has one or more linear sides. Also disclosed is a universal mold having removable arm members and socket members that can be configured to fabricate the border blocks, the corner blocks and the interior blocks.