Location
The Chilterns cover an area of 833 km2 (322 sq mi) and are 18 km (11 mi) at their widest and stretch 74 km (46 mi) in a southwest to northeast diagonal from Goring-on-Thames in Oxfordshire, through Buckinghamshire, via Dunstable Downs and Deacon Hill in Bedfordshire, to near Hitchin in Hertfordshire.
The boundary of the hills is clearly defined on the northwest side by the scarp slope. The dip slope, by its nature, merges with the landscape to the southeast. Similarly, the Thames provides a clear terminal to the southwest, whereas northeast of Luton the hills decline slowly in prominence.
Read more about this topic: Chiltern Hills