River Ingrebourne
| Ingrebourne Rainham Creek  | |
|---|---|
Looking north from the bridge on Berkeley Drive  | |
| Location | |
| Country | England | 
| Counties | Greater London | 
| London boroughs | Havering | 
| Towns | Upminster, Hornchurch, Rainham | 
| Physical characteristics | |
| Source | |
| • location | Brentwood, Essex | 
| Mouth | River Thames | 
 • location  | Rainham Marsh, Rainham | 
| Length | 43.3 km (26.9 mi) | 
| Discharge | |
| • location | Gaynes Park | 
| • average | 0.33 m3/s (12 cu ft/s) | 
| • minimum | 0.06 m3/s (2.1 cu ft/s)17 August 1972 | 
| • maximum | 29.0 m3/s (1,020 cu ft/s)21 November 1974 | 
| Basin features | |
| Tributaries | |
| • left | Weald Brook, Carters Brook, Paynes Brook | 
The River Ingrebourne /ˈɪŋɡərˌbɔːrn/ is a tributary of the River Thames 27 miles (43.3 km) in length. It is considered a strategic waterway in London, forming part of the Blue Ribbon Network. It flows through the London Borough of Havering roughly from north to south, joining the Thames at Rainham.