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The River Thames rises at Thames Head in Gloucestershire on the slopes of the Cotswolds and flows generally eastward to its mouth near Southend in Essex. At 215 miles long it is one of the longest rivers in Britain, and the longest entirely within England. It is one of the most important rivers in Britain. Link

Fiddler's Island is in the River Thames at Oxford. It is situated south of Port Meadow on the reach above Osney Lock.
The north part of the island sits between the River Thames and the top end of Castle Mill Stream, a Thames backwater. Fiddler's Island Stream flows to the east of the southern part of the island. To the south of the island, there is a short stretch of water known as the Sheepwash Channel linking back to the Castle Mill Stream and the Oxford Canal. The Thames Path runs the length of the complete island. Footbridges connect the island to both banks of the River Thames.