N18: 4.5 m clear of the highest tide in the London Bridge ledgers

N18 on the relief of London, with a tide staff: 4.5 m above the 1953 tide, the highest in the ledgers.

The lowest postcode in N18, N18 3BY, stands 4.5 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, N18 1AF, stands 26 m above it.

Ground at eight in ten of its postcodes: between 11 m and 21 m, measured from Ordnance Datum; the middle one stands at 13 m.
None lies in the Environment Agency's Flood Zone 3 from the sea.
Mostly in Enfield; partly in Haringey.

Open N18 on the map