The London/Buckinghamshire border - Colne - Harefield Moor

The London, Hillingdon/Buckinghamshire boundary goes northwards along the River Colne

The River Colne flows southwards

Post to the west Tilehouse Lane
Post to the south Harefield Moor

Post to the east Harefield Pit and Church Hill

Sites on the London, Hillingdon side of the border

Broadwater.
Access via a derelict area which was the plant area for the gravel pits. The lake is 80 hectares and supports a number of wooded islands. Around the edge are remnants of the original alluvial grasslands and valley alderwoods rising to beech and hornbeam woodland to the west. Broadwater Lake supports important numbers of waterbirds. Since there has been a natural colonisation by typical wetland plants and animals.

Grand Union Canal
Widewater winding hole

River Colne
Is the most natural feature of the site and it has a meandering channel in parts with some pools.

Long Pond

Harefield Pit,
This chalk pit was used as a landfill site and was filled by approximately 30 years ago, it has a strip of dense woodland on steeply undulating raised ground to the south, and a wooded seasonally damp basin to the north. Part of the southern wood is a Site of Special Scientific Interest. The pit provides a key section in the London Basin for a sequence through the Upper Chalk, Reading Beds and London Clay. It is also the only known site for calcareous floral remains in the Reading Beds. It is a disused chalk quarry which has been infilled leaving only the upper faces exposed above ground level.

Sources
Canal plan. web site
Harefield Pit. Wikipedia Web site
Mid Colne Valley. Wikipedia Web site

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