London SE1 is an area of central London on the south bank of the River Thames between Vauxhall Bridge and St Saviour's Dock (just east of Tower Bridge). SE1 stretches as far south as the Elephant and Castle. It also includes the localities of Bankside, the Borough, South Bank, Waterloo and parts of Bermondsey and Lambeth
South East 1 is the postal area which describes this bit of the city. London is divided into many postal areas (EC1, WC1, NW6, W6, E2 etc) - the A-Z Postcode Map of London explains how it all works.
SE1 has traditionally been off the beaten track for London tourists, but that is all changing now, with many "premier league" attractions now in the area, combined with excellent transport links, including the Jubilee Line Extension.
The area is best known for the South Bank Centre and Royal National Theatre. In the past few years other developments, such as the reconstruction of Shakespeare's Globe, the Tate Modern art gallery, the London Eye and the Millennium Bridge have served to reinforce SE1's status as part of Central London.
About 45,000 people live in 26,000 households in SE1.