Question: What district, in the London Borough of Tower Hamlets, is on the longest river entirely in England?
Context: Limehouse is a district in east London, in the London Borough of Tower Hamlets.  Located 3.9 mi east of Charing Cross, It is on the northern bank of the River Thames opposite Rotherhithe and between Ratcliff to the west and Millwall to the east. The Tower Division was a liberty, a historical form of local government, in the ancient county of Middlesex, England.  It was also known as the Tower Hamlets, and took its name from being under the special jurisdiction of the Constable of the Tower of London.  The name "Tower Hamlets" was subsequently used for the London Borough of Tower Hamlets created in 1965. Evelyn is an electoral ward in the northernmost part of the London Borough of Lewisham.  It is located in the Deptford area on the south bank of the River Thames, and is the only Lewisham ward that borders the Thames.  Occupying the northern corner of the London Borough of Lewisham, the Evelyn ward borders only one other Lewisham ward, which is "New Cross" to the south.  But Evelyn borders wards from three other London Boroughs, "Greenwich West" in the Royal Borough of Greenwich to the east, "Surrey Docks" of the London Borough of Southwark to the northwest, and across the River Thames on the Isle of Dogs, the "Millwall" ward from the London Borough of Tower Hamlets. The mayor of Tower Hamlets is a directly elected mayor of Tower Hamlets London Borough Council in east London, England.  The first election for this position occurred on 21 October 2010, taking on the executive function of the borough council.  The position is different from the previous largely ceremonial, annually appointed mayors of Tower Hamlets, who became known as the 'Chair of Council' after the first election and are now known as the 'Speaker of Council'.  The second election was held on 22 May 2014, the same day as the Tower Hamlets Council election, other United Kingdom local elections, and European Parliament elections, but the election result was declared void by the election court.  A by-election was held on 11 June 2015. Tower Hamlets First was a British political party represented in Tower Hamlets London Borough Council, which was launched to contest the 2014 local elections.  At the 2014 London borough council elections, it was the second largest party on Tower Hamlets Council and the fifth largest political party out of all London borough councils. The River Thames ( ) is a river that flows through southern England, most notably through London.  At 215 mi , it is the longest river entirely in England and the second longest in the United Kingdom, after the River Severn.  It also flows through Oxford (where it is called Isis), Reading, Henley-on-Thames and Windsor.  The lower reaches of the river are called the Tideway, derived from its long tidal reach up to Teddington Lock.  It rises at Thames Head in Gloucestershire, and flows into the North Sea via the Thames Estuary.  The Thames drains the whole of Greater London. Tower Hamlets London Borough Council is the local authority for the London Borough of Tower Hamlets in Greater London, England.  The council is unusual in that its executive function is controlled by a directly elected mayor of Tower Hamlets, currently John Biggs. UK pirate radio, unlicensed illegal broadcasting, was popular in the 1960s and experienced another surge of interest in the 1980s.  There are currently an estimated 150 pirate radio stations in the UK.  A large proportion of these pirate radio stations operate in London, with significant clusters in Harlesden and the wider London Borough of Brent, Crystal Palace, Stoke Newington, the London Borough of Southwark, the London Borough of Tower Hamlets and London Borough of Lambeth. Mansell Street is a street in East London, which is part of the London Inner Ring Road.  For most of its length from the north, this street marks the boundary between the City of London and the London Borough of Tower Hamlets.  However.  the southernmost part is entirely in Tower Hamlets. Tower Hamlets London Borough Council, the local authority for the London Borough of Tower Hamlets, is elected every four years.
Answer: Limehouse