The Aylesbury Vale (or Vale of Aylesbury) is a large area of gently rolling agricultural landscape located in the northern half of Buckinghamshire, England. Its boundary is marked by Milton Keynes to the north, Leighton Buzzard and the Chiltern Hills to the east and south, Thame to the south and Bicester and Brackley to the west. The vale is named after Aylesbury, the county town of Buckinghamshire. Two other towns lie within the vale and they are Winslow and Buckingham.