Abstract: The single buoy mooring system comprises a central element adapted to be anchored by means of anchor cables and a buoyant outer element rotatably arranged around the central element. The outer element comprises an open beam structure connected to a large diameter outer ring. Foam-filled fenders are secured to the large diameter outer ring. Preferably the fenders act as floats. An important advantage of this arrangement is that, when a ship moored to the system hits the system, the risk of damage to the ship or the system is substantially reduced as compared to the conventional single buoy mooring systems.