Anchorage assembly for a boat, comprising: - an anchor provided with: - a shaft extended along a longitudinal axis between a first end, intended to be connected to a lifting device of said boat, and a second end (21"); - a fluke mechanically connected to said shaft; - an elongated containment body, intended to be fixed to a hull of said boat and internally delimiting a channel, within which the shaft of said anchor is susceptible of sliding; the shaft of said anchor being movable between a lowered position, in which said shaft is placed outside said containment body and is free to rotate around said longitudinal axis and a raised position, in which said shaft is placed inside said containment body, with a predefined orientation with respect to said containment body and is substantially prevented from rotating around said longitudinal axis; - guide means configured for guiding the shaft of said anchor towards said predefined orientation during the movement from said lowered position to said raised position; characterized in that said guide means comprise: - at least one conveyance portion, made on said shaft, and provided with two slides which are extended with helical first grooves in circumferentially opposite senses from a common upper deflection end to a common lower connection end (41"); - at least one guide portion, made on said shaft and provided with a guide track which is extended with a second groove at least from the lower connection end (41") of said conveyance portion, along said shaft, substantially parallel to the longitudinal direction; - at least one engagement element fixed to said containment body and projecting inside said channel; the engagement element of said guide means being configured for interfering at least with the conveyance portion of said guide means and rotating the shaft of said anchor in said predefined orientation, wherein at least part of said engagement element is inserted in the second groove of said guide track in order to stably retain said shaft in said predefined orientation. - an anchor provided with: - a shaft extended along a longitudinal axis between a first end, intended to be connected to a lifting device of said boat, and a second end (21"); - a fluke mechanically connected to said shaft; - a shaft extended along a longitudinal axis between a first end, intended to be connected to a lifting device of said boat, and a second end (21"); - a fluke mechanically connected to said shaft; - an elongated containment body, intended to be fixed to a hull of said boat and internally delimiting a channel, within which the shaft of said anchor is susceptible of sliding; the shaft of said anchor being movable between a lowered position, in which said shaft is placed outside said containment body and is free to rotate around said longitudinal axis and a raised position, in which said shaft is placed inside said containment body, with a predefined orientation with respect to said containment body and is substantially prevented from rotating around said longitudinal axis; - guide means configured for guiding the shaft of said anchor towards said predefined orientation during the movement from said lowered position to said raised position; characterized in that said guide means comprise: - at least one conveyance portion, made on said shaft, and provided with two slides which are extended with helical first grooves in circumferentially opposite senses from a common upper deflection end to a common lower connection end (41"); - at least one guide portion, made on said shaft and provided with a guide track which is extended with a second groove at least from the lower connection end (41") of said conveyance portion, along said shaft, substantially parallel to the longitudinal direction; - at least one engagement element fixed to said containment body and projecting inside said channel; - at least one conveyance portion, made on said shaft, and provided with two slides which are extended with helical first grooves in circumferentially opposite senses from a common upper deflection end to a common lower connection end (41"); - at least one guide portion, made on said shaft and provided with a guide track which is extended with a second groove at least from the lower connection end (41") of said conveyance portion, along said shaft, substantially parallel to the longitudinal direction; - at least one engagement element fixed to said containment body and projecting inside said channel; the engagement element of said guide means being configured for interfering at least with the conveyance portion of said guide means and rotating the shaft of said anchor in said predefined orientation, wherein at least part of said engagement element is inserted in the second groove of said guide track in order to stably retain said shaft in said predefined orientation.