Parks and open spaces in Harrow

From the Wikipedia page

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: 57 acre 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