The Farnborough/Aldershot built-up area or Blackwater Valley Conurbation or Aldershot Urban Area is the name used by the ONS to refer to the loose conurbation on the border between Surrey, Berkshire and Hampshire in England. They give it a population of 252,937 in 2011 up by around 4 rom the 2001 figure of 243,344. This makes it the 29th largest built up area in England and Wales. The conurbation is known by some particularly when referring to Hart District and Surrey Heath as the Camberley Urban Area.