Chiltern Hills

The Chiltern Hills are a chalk escarpment in the UK northwest of London, covering 660 square miles (1,700 km2) across Oxfordshire, Buckinghamshire, Hertfordshire, and Bedfordshire, stretching 45 miles (72 km) from Goring-on-Thames in the southwest to Hitchin in the northeast. The hills are 12 miles (19 km) at their widest.

Chiltern Hills
Highest point
PeakHaddington Hill
Elevation267 m (876 ft)
Dimensions
Length74 km (46 mi)
Width18 km (11 mi)
Area1,700 km2 (660 sq mi)
Geography
Location of the Chiltern Hills AONB in England
LocationSoutheast of England
East of England
CountryUnited Kingdom
CountiesBedfordshire
Buckinghamshire
Hertfordshire
Oxfordshire
Range coordinates51°40′N 0°55′W
Geology
Type of rockchalk downland

In 1965, almost half of the Chiltern Hills was designated as an Area of Outstanding Natural Beauty (AONB). The northwest boundary is clearly defined by the escarpment. The dip slope is by definition more gradual, and merges with the landscape to the southeast. The southwest endpoint is the River Thames. The hills decline slowly in prominence in northeast Bedfordshire.

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