N1: 9.6 m clear of the highest tide in the London Bridge ledgers

N1 on the relief of London, with a tide staff: 9.6 m above the 1953 tide, the highest in the ledgers.

The lowest postcode in N1, N1 9NW, stands 9.6 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, N1 1JT, stands 37 m above it.

Ground at eight in ten of its postcodes: between 18 m and 37 m, measured from Ordnance Datum; the middle one stands at 22 m.
None lies in the Environment Agency's Flood Zone 3 from the sea.
Mostly in Islington; partly in Hackney.

Open N1 on the map