Cambridgeshire (abbreviated Cambs.) is a ceremonial county in the East of England and East Anglia. It is bordered by Lincolnshire to the north, Norfolk to the north-east, Suffolk to the east, Essex and Hertfordshire to the south, and Bedfordshire and Northamptonshire to the west. The largest settlement is the city of Peterborough, and the city of Cambridge is the county town. The county has an area of 3,389 km2 (1,309 sq mi) and a population of 852,523. Peterborough (179,349) and Cambridge (145,674), located in the north-west and south respectively, are by far the largest settlements. The remainder of the county is rural, and contains the city of Ely (20,112) and towns such as Wisbech and St Neots. Cambridgeshire contains six local government districts; five are part of a two-tier non-metropolitan county also called Cambridgeshire, and the district of Peterborough is a unitary area. The local authorities collaborate through Cambridgeshire and Peterbrough Combined Authority. The county did not historically include Huntingdonshire or the Soke of Peterborough, which was part of Northamptonshire. The north and east of the county are dominated by the Fens, an extremely flat, drained marsh maintained by drainage ditches and dykes. Holme Fen is the UK's lowest physical point, at 2.75 m (9 ft) below sea level. The flatness of the landscape makes the few areas of higher ground, such as that Ely is built on, very conspicuous. The landscape in the south and west is gently undulating. Cambridgeshire's principal rivers are the Nene, which flows through the north of the county and is canalised east of Peterborough; the Great Ouse, which flows from west to east past Huntingdon and Ely; and the Cam, a tributary of the Great Ouse which flows through Cambridge. Source: Wikipedia (en)