- a county in E England. 1316 sq. mi. (3410 sq. km).
- a county of E England, in East Anglia: includes the former counties of the Isle of Ely and Huntingdon and lies largely in the Fens: Peterborough became an independent unitary authority in 1998. Administrative centre: Cambridge. Pop (excluding Peterborough): 571 000 (2003 est). Area (excluding Peterborough): 3068 sq km (184 sq miles)