Folly Brook is a long

brook A brook is a small river or natural stream of fresh water. It may also refer to: Computing *Brook, a programming language for GPU programming based on C *Brook+, an explicit data-parallel C compiler *BrookGPU, a framework for GPGPU programming ...

in the

London Borough of Barnet The London Borough of Barnet () is a suburban London boroughs, London borough in North London. The borough was formed in 1965 from parts of the ceremonial counties of Middlesex and Hertfordshire. It forms part of Outer London and is the largest ...

. It is a tributary of

Dollis Brook Dollis Brook runs through the London Borough of Barnet in north London. It is a tributary of the River Brent, which is itself a tributary of the River Thames. The Dollis Valley Greenwalk follows almost all of Dollis Brook, apart from a short sec ...

, which is a tributary of the

River Brent The River Brent is a river in west and northwest London, England, and a tributary of the River Thames. in length, it rises in the Borough of Barnet and flows in a generally south-west direction before joining the Tideway stretch of the Thame ...

, which is a tributary of the

River Thames The River Thames ( ), known alternatively in parts as the The Isis, River Isis, is a river that flows through southern England including London. At , it is the longest river entirely in England and the Longest rivers of the United Kingdom, se ...

. Folly Brook is lined for most of its length by narrow strips of woodland and scrub, with a good variety of trees and shrubs. It is one of the best streams in Barnet for small aquatic invertebrates, including several species of caddis fly and a

stonefly Plecoptera is an order of insects, commonly known as stoneflies. Some 3,500 species are described worldwide, with new species still being discovered. Stoneflies are found worldwide, except Antarctica. Stoneflies are believed to be one of the mo ...

, which are only found in unpolluted waters. Dollis Brook Folly Brook

The upper brook

Folly Brook rises near the bottom of Highwood Hill,

Mill Hill Mill Hill is a suburb in the London Borough of Barnet, England. It is situated around northwest of Charing Cross. Mill Hill was in the historic county of Middlesex until 1965, when it became part of Greater London. Its population counted 18, ...

, and flows east through fields and public open spaces to

Woodside Park Woodside Park is a suburban residential area in London. It is located in the London Borough of Barnet, in the North Finchley postal district of N12. Description The area to the east of the tube station consists predominantly of large Victor ...

. From Highwood Hill to

Darland's Lake Nature Reserve Darland's Lake Nature Reserve is a nature reserve south of Totteridge Village in Barnet, England. It is owned by the London Borough of Barnet and was managed from 1971 by the Hertfordshire and Middlesex Wildlife Trust, and more recently by the b ...

the brook passes through private land which is not open to public access, apart from a short section next to a footpath through Folly Farm. Darland's Lake was originally ornamental, created by damming the brook, but the lake and surrounding woods are now a nature reserve.

The lower brook

The lower part of the brook from Darland's Lake through Folly Brook Valley to the junction with Dollis Brook is public open space. A footpath alongside the brook starts close to the Darland's noticeboard east of the lake, and goes through woods to grassland between Burtonhole Lane and Pasture and Woodridge Nature Reserve, where it is joined by its tributary, Burtonhole Brook. Folly Brook then goes under Southover to meet Dollis Brook not far from Woodside Park Underground station, connecting it with the

Dollis Valley Greenwalk The Dollis Valley Greenwalk (or Green Walk) is a footpath route in the London Borough of Barnet in London, England, between Moat Mount Nature Reserve in Mill Hill and Hampstead Heath. The route is designed to act as a link between the Capital ...

. Folly Brook and Darland's Lake Nature Reserve are a Site of Borough Importance for Nature Conservation, Grade I.

Boundary

Until 1965 the brook marked the boundary between the boroughs of

Hendon Hendon is an urban area in the Borough of Barnet, North-West London northwest of Charing Cross. Hendon was an ancient manor and parish in the county of Middlesex and a former borough, the Municipal Borough of Hendon; it has been part of Great ...

to the south and

Totteridge Totteridge is a residential area and former village in the London Borough of Barnet, England. It is a mixture of suburban development and open land (including some farmland) situated 8 miles (13 km) north north-west of Charing Cross. It ...

to the north. Hendon was in

Middlesex Middlesex (; abbreviation: Middx) is a Historic counties of England, historic county in South East England, southeast England. Its area is almost entirely within the wider urbanised area of London and mostly within the Ceremonial counties of ...

and Totteridge in

Hertfordshire Hertfordshire ( or ; often abbreviated Herts) is one of the home counties in southern England. It borders Bedfordshire and Cambridgeshire to the north, Essex to the east, Greater London to the south, and Buckinghamshire to the west. For govern ...

, and the brook was thus also the boundary between the two counties.

Notes

{{authority control Rivers of London Nature reserves in the London Borough of Barnet 2Folly

The upper brook

The lower brook

Boundary

See also

Notes