Hertfordshire is a county in southern England, bordered by Bedfordshire to the north, Cambridgeshire to the north-east, Essex to the east, Buckinghamshire to the west and Greater London to the south. For government statistical purposes, it is placed in the East of England region.
In 2013, the county had a population of 1,140,700 living in an area of. Four towns have between 50,000 and 100,000 residents: Hemel Hempstead, Stevenage, Watford and St Albans. Hertford, once the main market town for the medieval agricultural county, derives its name from a hart and a ford, used as the components of the countys coat of arms and flag. Elevations are high for the region in the north and west. These reach over 240m in the western projection around Tring which is in the Chilterns. The countys borders are approximately the watersheds of the Colne and Lea; both flowing to the south; each accompanied by a canal. Hertfordshires undeveloped land is mainly agricultural and much is protected by green belt.
The countys landmarks span many centuries, ranging from the Six Hills in the new town of Stevenage built by local inhabitants during the Roman period, to Leavesden Film Studios. Leavesden filmed much of the UK-based $7.7 Bn box office Harry Potter film series and has the countrys studio tour. The volume of intact medieval and Tudor buildings surpasses London, in places in well-preserved conservation areas, especially in St Albans which includes some remains of Verulamium, the town where in the 3rd century an early recorded British martyrdom took place. Saint Alban, a Romano-British soldier, took the place of a Christian priest and was beheaded on Holywell Hill. His martyrs cross of a yellow saltire on a blue background is reflected in the flag and coat of arms of Hertfordshire.
Hertfordshire is well-served with motorways and railways, providing good access to London. The largest sector of the economy of the county is in services.
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