Surrey () is a ceremonial and non-metropolitan county in South East England, bordering Greater London to the south west. Surrey has a large rural area, and several significant urban areas which form part of the Greater London Built-up Area. With a population of approximately 1.2 million people, Surrey is the 12th-most populous county in England. The most populated town in Surrey is Woking, followed by Guildford. The county is divided into eleven districts with borough status. Between 1893 and 2020, Surrey County Council was headquartered at County Hall, Kingston-upon-Thames (now part of Greater London) but is now based at Woodhatch Place, Reigate. In the 20th century several alterations were made to Surrey's borders, with territory ceded to Greater London upon its creation and some gained from the abolition of Middlesex. Surrey is bordered by Greater London to the north east, Kent to the east, Berkshire to the north west, West Sussex to the south, East Sussex to the south east, and Hampshire to the west. Geography Surrey is divided in two by the chalk ridge of the North Downs, running east–west. The ridge is pierced by the rivers Wey and Mole, tributaries of the Thames, which formed the northern border of the county before modern redrawing of county boundaries, which has left part of its north bank within the county. To the north of the Downs the land is mostly flat, forming part of the basin of the Thames. The geology of this area is dominated by London Clay in the east, Bagshot Sands in the west and alluvial deposits along the rivers. To the south of the Downs in the western part of the county are the sandstone Surrey Hills, while further east is the plain of the Low Weald, rising in the extreme southeast to the edge of the hills of the High Weald. The Downs and the area to the south form part of a concentric pattern of geological deposits which also extends across southern Kent and most of Sussex, predominantly composed of Wealden Clay, Lower Greensand and the chalk of the Downs. Much of Surrey is in the Metropolitan Green Belt. It contains valued reserves of mature woodland (reflected in the official logo of Surrey County Council, a pair of interlocking oak leaves). Among its many notable beauty spots are Box Hill, Leith Hill, Frensham Ponds, Newlands Corner and Puttenham & Crooksbury Commons. Surrey is the