A fibre-cement-based flooring panel for a flooring system comprising a plurality of mechanically connectable panels, the panel comprising a first connecting profile along a first side and a second connecting profile along a second side, which is parallel to the first side, the first connecting profile being configured for locking engagement with the second connecting profile of another panel both horizontally and vertically, wherein the first connecting profile comprises a protruding strip at the bottom face of the panel , the protruding strip terminating in a locking element projecting towards the top face of the panel ; wherein the second connecting profile comprises an overhanging tongue delimiting at its bottom a recess for receiving the protruding strip , the recess comprising a locking groove configured for cooperating with the locking element so as to provide a horizontal locking effect; wherein the first connecting profile comprises a tongue groove arranged above a stem portion of the protruding strip , the tongue groove being configured to accommodate the tip of the overhanging tongue so as to provide a vertical locking effect; wherein the tip of the overhanging tongue comprises an upper contact surface and a lower contact surface that are inclined with respect to each other, wherein the tongue groove is delimited by an upper delimiting surface and a lower delimiting surface , and wherein the upper and lower contact surface of the overhanging tongue are configured to be put into contact with the upper and lower delimiting surface , respectively, of the tongue groove , characterized in that the angles between said upper contact surface and said lower contact surface and between said upper delimiting surface and said lower delimiting surface are comprised in the range from 3° to 20°. wherein the first connecting profile comprises a protruding strip at the bottom face of the panel , the protruding strip terminating in a locking element projecting towards the top face of the panel ; wherein the second connecting profile comprises an overhanging tongue delimiting at its bottom a recess for receiving the protruding strip , the recess comprising a locking groove configured for cooperating with the locking element so as to provide a horizontal locking effect; wherein the first connecting profile comprises a tongue groove arranged above a stem portion of the protruding strip , the tongue groove being configured to accommodate the tip of the overhanging tongue so as to provide a vertical locking effect; wherein the tip of the overhanging tongue comprises an upper contact surface and a lower contact surface that are inclined with respect to each other, wherein the tongue groove is delimited by an upper delimiting surface and a lower delimiting surface , and wherein the upper and lower contact surface of the overhanging tongue are configured to be put into contact with the upper and lower delimiting surface , respectively, of the tongue groove , characterized in that the angles between said upper contact surface and said lower contact surface and between said upper delimiting surface and said lower delimiting surface are comprised in the range from 3° to 20°. <EOS>