River Ingrebourne

The River Ingrebourne is a tributary of the River Thames, stretching 27 miles through the London Borough of Havering. It rises near Brentwood in Essex and flows south-west, passing under the M25 motorway near Junction 28. Three tributaries join it early in its course: Weald Brook, Carters Brook and Paynes Brook. The river then skirts Harold Hill before crossing under the Great Eastern Main Line. After this, it enters a large flood-plain before threading between the suburbs of Upminster and Hornchurch. The Ingrebourne is recognised for its ecological importance, with the Ingrebourne Marshes designated as a Site of Special Scientific Interest. The marshes support diverse wildlife and extensive wetland reeds. The river itself forms part of the Blue Ribbon Network, a policy initiative in the London Plan identifying strategic waterways. Along its route, the Ingrebourne Valley is protected as a Local Nature Reserve. Public open spaces such as Gaynes Parkway, the Ingrebourne Valley Greenway and Hornchurch Country Park line its banks. Visitors to the area can follow the river through these green spaces, enjoying views of the flood-plain and the marshes. The river divides near Rainham, with the main channel becoming Rainham Creek and flowing into the Thames. The second channel forms the Wennington Sewers complex. The marshes to the east and west of the creek provide habitats for wildlife, while the surrounding parks offer paths for walking and cycling. The river’s route offers a quiet contrast to the built-up areas nearby.