Sumptermead Ait is an island in the River Thames

River Thames

The River Thames flows through southern England. It is the longest river entirely in England and the second longest in the United Kingdom. While it is best known because its lower reaches flow through central London, the river flows alongside several other towns and cities, including Oxford,...

 in England on the reach above Old Windsor Lock

Old Windsor Lock

Old Windsor Lock is a lock on the River Thames in England close to Old Windsor on the side of the river towards the town. The lock marks the start of the New Cut, built in 1822 by the Thames Navigation Commissioners, which created Ham Island in the hook of the old river...

, near Datchet

Datchet

Datchet is an English Thameside village and civil parish situated in the unitary authority of Windsor and Maidenhead in the county of Berkshire. It was transferred to Berkshire from Buckinghamshire in 1974....

 Berkshire

Berkshire

Berkshire is a historic county in the South of England. It is also often referred to as the Royal County of Berkshire because of the presence of the royal residence of Windsor Castle in the county; this usage, which dates to the 19th century at least, was recognised by the Queen in 1957, and...

. The island is a thin wooded strip separated by a narrow channel on the Datchet side. In 1995 a Thames side path was created here for the diverted Thames Path

Thames Path

The Thames Path is a National Trail, opened in 1996, following the length of the River Thames from its source near Kemble in Gloucestershire to the Thames Barrier at Charlton. It is about long....

.

The island has a long history, being recorded as "Sondremede" in 1263, when given to the prioress of St Helens in London, and "Saunder-meade" in 1586, when leased to the queens laundress.