District in the London Borough of Havering.
Ardleigh Green /ˈɑːrdli/ is an area of outer east London, England in the London Borough of Havering. It is centred 15.5 miles (25 km) east-northeast of Charing Cross. As with all parts of its Borough, it is in the Historic County of Essex. This part of London is a strongly suburban and predominantly residential.
More information on the Wikipedia page [1].
The area naturally drains to form the headwaters of a stream, The Ravensbourne which briefly flows, before joining the River Rom.