The area sloping to the River Lea in the east was in the far north of Middlesex centred on the town of Enfield.

The area formed part of the London conurbation and was much reduced over the course of its existence, in 1918 and then insignificantly in 1945 due to suburbanisation and urbanisation.

[1][2] These reflected ancient parishes and the smallest in the non-metropolitan county, Monken Hadley was a small rectangle in the south-centre of the seat.

Friern Barnet formed a projection in the south-west running north-west reflecting the eccentric shape of this part of the county border.

A "Wood Green" seat was devised which took the Southgate southern parts of Enfield and western extreme of Edmonton parish.