A swing mooring element comprising a modular pontoon (40) configured to enable two vessels (41, 42) to be moored side by side and including an area (49) between the vessels which allows a person to walk between the vessels. The pontoons (67, 68, 69, 70) may also be interconnected to form a mooring assembly wherein each pontoon (67, 68, 69, 70) is capable of mooring at least two boats.