High Quality Content by WIKIPEDIA articles! Twyford Down is a small area of ancient chalk downland lying directly to the southeast of Winchester, Hampshire, England. The down`s 144-metre (472 ft) summit, known as Deacon Hill, is towards the north-eastern edge of the area which is renowned for its dramatic rolling scenery, ecologically rich grassland and as a Site of Special Scientific Interest (SSSI). It is situated at the western extremity of the South Downs National Park, having previously been designated as part of the East Hampshire AONB (Area of Outstanding Natural Beauty).