From the Wikipedia page [1] The main areas of open space are: * Bentley Priory, Stanmore: 165 acres (66ha) open space; Site of Special Scientific Interest and Local Nature Reserve * Canons Park: 45 acres (18ha) 18th century parkland * Grim's Dyke Open Space, Harrow Weald * Harrow Weald Common, Harrow Weald * Headstone Manor Recreation Park: Template under construction. including the Museum and Headstone Manor & Bessborough Cricket Club * Pinner Park Farm tenant dairy farmers Hall & Sons: total {230 acre} * Stanmore Common: 120 acres (48ha); Local Nature Reserve * Stanmore Country Park: 77.5 acres (31ha); Local Nature * Streamside Reservation, alongside Yeading Brook, Pinner