N21: 17 m clear of the highest tide in the London Bridge ledgers

N21 on the relief of London, with a tide staff: 17 m above the 1953 tide, the highest in the ledgers.

The lowest postcode in N21, N21 2AU, stands 17 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, N21 3DB, stands 59 m above it.

Ground at eight in ten of its postcodes: between 26 m and 59 m, measured from Ordnance Datum; the middle one stands at 40 m.
None lies in the Environment Agency's Flood Zone 3 from the sea.
In Enfield.

Open N21 on the map