Hertfordshire (pronounced 'Hartfordshire') is an inland county, officially part of the East of England Government region.
It is located to the north of Greater London, bordering the London boroughs (from west to east) of Hillingdon, Harrow, Barnet and Enfield. To the east of Hertfordshire is Essex, to the west is Buckinghamshire and to the north are Bedfordshire, Luton and Cambridgeshire.
The current administrative districts of Hertfordshire are (approximately north to south):
- North Hertfordshire
- East Hertfordshire
- Welwyn Hatfield
- St Albans
- Three Rivers