Bollo Brook or Bollar Brook is a subterranean river

Subterranean river

A subterranean river is a river that runs wholly or partly beneath the ground surface – one where the riverbed does not represent the surface of the Earth ....

 in West London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

 which flows into the River Thames

River Thames

The River Thames flows through southern England. It is the longest river entirely in England and the second longest in the United Kingdom. While it is best known because its lower reaches flow through central London, the river flows alongside several other towns and cities, including Oxford,...

.

Bollo Brook rises in Acton

Acton, London

Acton is a district of west London, England, located in the London Borough of Ealing. It is situated west of Charing Cross.At the time of the 2001 census, Acton, comprising the wards of East Acton, Acton Central, South Acton and Southfield, had a population of 53,689 people...

 and to the west of Turnham Green

Turnham Green

Turnham Green is a public park situated on Chiswick High Road, Chiswick, London. It is separated in two by a small road. Christ Church stands on the eastern half of the green. A war memorial stands on the eastern corner...

 and enters the grounds of Chiswick House

Chiswick House

Chiswick House is a Palladian villa in Burlington Lane, Chiswick, in the London Borough of Hounslow in England. Set in , the house was completed in 1729 during the reign of George II and designed by Lord Burlington. William Kent , who took a leading role in designing the gardens, created one of the...

. There it is joined by a stream from a lake near Sydney House to the west. The waters feed the lakes and fountains at Chiswick House, and then drain into the River Thames downstream of Barnes Bridge

See also

• Tributaries of the River Thames
  Tributaries of the River Thames
  This article lists the tributaries of the River Thames, in England. It also includes significant backwaters and waterways which also have confluences with the main stream of the River Thames.Most of the tributaries are natural, but a few were man-made...
  
  
• Subterranean rivers of London
  Subterranean rivers of London
  The subterranean or underground rivers of London are the tributaries of the River Thames and River Lea that were built over during the growth of the metropolis of London...
  
  
• List of rivers in England
• Rivers