Swan Island is a private mooring island in the Thames at Twickenham, in the London Borough of Richmond upon Thames, London, England. It is on the Tideway[a] about 3⁄4 mile (1.2 km) north of and thus below Teddington Lock.
The island has a commercial boatyard in addition to residential mooring for boats. It is connected to the Twickenham bank by a small bridge, which is suitable for vehicles as well as foot traffic.
Originally an osier bed, it measured 1⁄4 acre (0.10 ha) per Ordnance Survey maps of 1897[1] and 1898.[2][3]
A larger island stood north-west which has become the playground, bowling green, café and park Radnor Gardens, Strawberry Hill/Vale.
51°26′21″N 00°19′52″W / 51.43917°N 0.33111°W / 51.43917; -0.33111