Abstract: A ground-reinforcing grid in which: (i) the ground-reinforcing grid comprises a plurality of modular units (2); (ii) each modular unit (2) comprises a plurality of cells (4), rib members (6) which connect the cells (4) together such that the cells (4) are spaced apart from each other by the rib members (6), and connector means (8) for connecting the modular units (2) together; (iii) each modular unit (2) has rigidity to enable the ground-reinforcing grid to provide the ground reinforcement; (iv) each modular unit (2) has flexibility to enable the ground-reinforcing grid to flex and accommodate loads when in use on ground that provides less than an optimal base for the ground-reinforcing grid; and (v) the flexibility is provided by flexing of the cells (4) and not flexing of the rib members (6) whereby the flexibility is a limited flexibility that does not adversely affect the rigidity of the ground-reinforcing grid that is required for the ground reinforcement.