Abbey River Tideway where there are two larger islands. It is much smaller than Canvey Island and the Isle of Sheppey and narrowly ahead of Andersey Island facing Abingdon-on-Thames, another market town with an abbey which had multiple medieval mills, another of note being Westminster Abbey, the island of which Thorney Island no longer exists. The outfall of the Abbey River is 400 m above Chertsey Bridge, into the weir pool of Chertsey Weir. The manmade strictly-considered "island" the bypass channel forms is outranked in size since the 2002 completion of the Jubilee River by the example containing Dorney and Eton, Berkshire.
Canvey Island along with the Benfleet Urban District in the Local Government Act 1972 to form the local government district and borough of Castle Point. Since the 2010 General Election, the Member of Parliament representing the parliamentary constituency of Castle Point has been Rebecca Harris of the Conservative Party. Canvey holds two seats on Essex County Council. , the seat of Canvey Island West is represented by Ray Howard of the Conservative Party, while Canvey Island East is taken by Brian Wood (replaced in May 2013 by Dave Blackwell) of the Canvey Island Independent Party. Canvey is represented on Castle Point Borough