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.