Buckinghamshire, a county in south central England, includes the geographic formation Chiltern Hills and the county's southern border is the Thames River. This Home County has several notable historical sites including Stowe Landscaped Gardens, Waddeson Manor, West Wycombe Park, Cleveden, Chequers, Hughendon Manor, Bletchley Park, Mentmore Towers, and the town of Olney -- home to William Cowper and John Newton, writers of the hymn Amazing Grace.