The proposed line guiding system for at least one heavy and/or rigid line, for example a power cable for shore-side power supply for a ship (alternative maritime power), has a winding device which is rotatable about an axis of rotation for coiling and uncoiling the line and a rotary guide for the line from a first point to a relatively rotatable second point. The rotary guide has a helical guiding course having first helical layers, in which the line is wound about the axis of rotation, and second helical layers, in which the line is wound in the opposite direction. A return curve connects the two helical layers. According to the invention, the rotary guide has a tubular support sleeve which is coaxial with respect to the axis of rotation and serves to support the helical layers radially outwards or radially inwards. Furthermore, a rotary decoupling structure is provided, by which helical layers supported on the support sleeve are decoupled from the winding device.