Oxfordshire is the most rural county in the South East. It has a population of around 666,100, one third of which lives in towns and villages of less then 10,000 people. The county is a popular visitor destination for its rural beauty and numerous market towns. The geology has resulted in a varied countryside. In the northeast is the limestone of the cotswolds and to the south and south east are the open chalk hills of the North Wessex Downs.