Where Is It?

Originating from Totteridge in Barnet and Stanmore in Harrow, the River Brent Catchment includes all the land that drains into the Thames at Brentford in Hounslow.

How Big Is It?

Approximately 175 square kilometres of land drain into the Thames via this catchment. The River Brent is 16 kilometres long, while its tributaries total another 66 kilometres.

Natural Features

Historically, the river would have meandered particularly in the upper parts around Totteridge and Stanmore, while the lower part was once extensive marshland. Some upper reaches of the Dollis Brook and parts of the River Brent in Ealing between Perivale and Hanwell still keep some of their original natural features and shape.


Like many urban rivers in and around London, the River Brent and its tributaries have undergone significant changes. These changes have resulted in its health decreasing through either physical changes to the river or poor water quality entering it from the surrounding areas. Some of these changes include straightening the river with concrete and artificial channels, or, making it disappear into underground tunnels.

Navigable Waterway

The Grand Union Canal crosses the catchment from East to West and merges with the River Brent near Green Lane in Ealing. Canal Feeders and the Welsh Harp Reservoir are regulating water levels so the GUC can be navigable.

Other Forms Of Transport

There are major transport links including railways routes from Paddington, Euston, the Metropolitan, the Jubilee, the M1 and the M4. Industrial estates, housing developments and visitors to this part of London benefit from good access to this part of London. Why not start discovering this watercourse by paying a visit to its Sites of Special Scientific Interest (SSSIs), the Welsh Harp Reservoir and Bentley Priory at the start of the Edgware Brook.


Design by LTD Design Consultants and build by Garganey Consulting.