A marine vessel comprising: a bow section extending from a vessel bow, a stern section extending from a vessel stern and a centreline; and a planing hull comprising: a hull bow adjacent to or forming the vessel bow and a hull stern forming the vessel stern, the bow section comprising the hull bow and the stern section comprising the hull stern; a vee bottom section extending along the centreline from the stern section to the bow section, the vee bottom section being V-shaped and forming a keel of the marine vessel; and a pair of retainer walls (40, 41) extending from the stern section towards the bow section along either side of the vee bottom section, wherein: each retainer wall (40, 41) extends downwardly parallel to, or at an acute angle to, the centreline; each retainer wall (40, 41) extends downwardly at a retainer wall angle β relative to horizontal, which is in the range of from 70 degrees to 90 degrees inclusive in the stern section; the lowermost edges of the retainer walls (40, 41) rise away from the keel from the hull stern by the lowermost edges having a greater longitudinal angle (δ) than the keel, the longitudinal angle (δ) being the angle relative to the horizontal plane and a keel line, the keel line extending along and projected from the keel; and the vee bottom section is configured to, in use, direct water outwardly from the centreline towards the retainer walls (40, 41) and the retainer walls (40, 41) are configured to downwardly direct said outwardly directed water and prevent most of this wash from escaping outboard to an outer edge of the hull for providing lift to the marine vessel. a bow section extending from a vessel bow, a stern section extending from a vessel stern and a centreline; and a planing hull comprising: a hull bow adjacent to or forming the vessel bow and a hull stern forming the vessel stern, the bow section comprising the hull bow and the stern section comprising the hull stern; a vee bottom section extending along the centreline from the stern section to the bow section, the vee bottom section being V-shaped and forming a keel of the marine vessel; and a pair of retainer walls (40, 41) extending from the stern section towards the bow section along either side of the vee bottom section, wherein: a hull bow adjacent to or forming the vessel bow and a hull stern forming the vessel stern, the bow section comprising the hull bow and the stern section comprising the hull stern; a vee bottom section extending along the centreline from the stern section to the bow section, the vee bottom section being V-shaped and forming a keel of the marine vessel; and a pair of retainer walls (40, 41) extending from the stern section towards the bow section along either side of the vee bottom section, wherein: each retainer wall (40, 41) extends downwardly parallel to, or at an acute angle to, the centreline; each retainer wall (40, 41) extends downwardly at a retainer wall angle β relative to horizontal, which is in the range of from 70 degrees to 90 degrees inclusive in the stern section; the lowermost edges of the retainer walls (40, 41) rise away from the keel from the hull stern by the lowermost edges having a greater longitudinal angle (δ) than the keel, the longitudinal angle (δ) being the angle relative to the horizontal plane and a keel line, the keel line extending along and projected from the keel; and the vee bottom section is configured to, in use, direct water outwardly from the centreline towards the retainer walls (40, 41) and the retainer walls (40, 41) are configured to downwardly direct said outwardly directed water and prevent most of this wash from escaping outboard to an outer edge of the hull for providing lift to the marine vessel.