Hounslow Heath is one of London's largest nature reserves. The last surviving remnant of a once-huge heath that covered most of south-west Middlesex, the heath boasts a rich and colourful heritage, including a period as an army mustering and training ground, a notorious haunt of highwaymen and the venue for one of the world’s first commercial airports. Today, the heath is managed for wildlife and supports several rare or declining plant and animal species.
The Heath is situated in the west/southwest quadrant of Greater London, in the ancient county of Middlesex (now defunct). The site is originally and historically part of the Thames Valley flood plain and ecologically now just a remnant of a greater lowland heath system stretching off towards Surrey.