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Welwyn Hatfield, district, administrative and historic county of Hertfordshire, southeastern England, directly north of the metropolitan county of Greater London. Welwyn Garden City is the district seat. Welwyn Hatfield district is an area of rolling open countryside within the Thames basin, and its southern sections are part of the Greater London Green Belt. Welwyn Garden City and Hatfield, located 3 miles (5 km) apart and about 30 miles northwest of central London, were both designated...