A floating wind turbine farm comprising: a plurality of anchors (20, 202, 204, 206, 208) fixed in or on a bed of a body of water; a plurality of floating wind turbine platforms, each floating wind turbine platform having a buoyant base assembly and a horizontal-axis wind turbine tower mounted centrally thereon and comprising a nacelle, a hub and rotor blades installed on the tower to define the horizontal-axis floating wind turbine platform, the buoyant base assembly including a keystone, three buoyant bottom beams extending radially outward of the keystone and perpendicularly to a longitudinal axis of the wind turbine tower, wherein a buoyant outer column is mounted to a distal end of each of the three buoyant bottom beams, the outer columns extending perpendicularly to the buoyant bottom beams; and a plurality of mooring lines (200, 212), the plurality of floating wind turbine platforms deployed in the body of water being attached to one of the anchors (20, 202, 204, 206, 208) by a mooring line (200, 212); wherein each floating platform of the plurality of floating wind turbine platforms comprises at least three mooring lines (200, 212) which are extending between the floating wind turbine platform and one of the anchors (20, 202, 204, 206, 208); wherein a first and a second mooring line (200, 212) of the three mooring lines (200, 212) of each floating wind turbine platform each intersects at one of the plurality of anchors (20, 202, 204, 206, 208) with one of the three mooring lines (200, 212) of an adjacent floating wind turbine platform, such that the at least first and second mooring lines (200, 212) of the floating wind turbine platforms define the vertices of a regular hexagon; characterized in that the mooring lines (200, 212) are taut mooring lines which are attached to the columns such that in use, the buoyant base assembly is located below water level. a plurality of anchors (20, 202, 204, 206, 208) fixed in or on a bed of a body of water; a plurality of floating wind turbine platforms, each floating wind turbine platform having a buoyant base assembly and a horizontal-axis wind turbine tower mounted centrally thereon and comprising a nacelle, a hub and rotor blades installed on the tower to define the horizontal-axis floating wind turbine platform, the buoyant base assembly including a keystone, three buoyant bottom beams extending radially outward of the keystone and perpendicularly to a longitudinal axis of the wind turbine tower, wherein a buoyant outer column is mounted to a distal end of each of the three buoyant bottom beams, the outer columns extending perpendicularly to the buoyant bottom beams; and a plurality of mooring lines (200, 212), the plurality of floating wind turbine platforms deployed in the body of water being attached to one of the anchors (20, 202, 204, 206, 208) by a mooring line (200, 212); wherein each floating platform of the plurality of floating wind turbine platforms comprises at least three mooring lines (200, 212) which are extending between the floating wind turbine platform and one of the anchors (20, 202, 204, 206, 208); wherein a first and a second mooring line (200, 212) of the three mooring lines (200, 212) of each floating wind turbine platform each intersects at one of the plurality of anchors (20, 202, 204, 206, 208) with one of the three mooring lines (200, 212) of an adjacent floating wind turbine platform, such that the at least first and second mooring lines (200, 212) of the floating wind turbine platforms define the vertices of a regular hexagon; characterized in that the mooring lines (200, 212) are taut mooring lines which are attached to the columns such that in use, the buoyant base assembly is located below water level.