Hounslow Heath is a local nature reserve in the London Borough of Hounslow and at a point borders Richmond upon Thames. The public open space, which covers 200 acres, is all that remains of the historic Hounslow Heath which covered more than 4,000 acres. The present day area is bounded by A315 Staines Road, A3063 Wellington Road Sou…Hounslow Heath is a local nature reserve in the London Borough of Hounslow and at a point borders Richmond upon Thames. The public open space, which covers 200 acres, is all that remains of the historic Hounslow Heath which covered more than 4,000 acres. The present day area is bounded by A315 Staines Road, A3063 Wellington Road South, A314 Hanworth Road, and the River Crane.