WC2B: no postcode below a spring high tide, the lowest 0.3 m above it

WC2B on the relief of London, with a tide staff: Its lowest postcode is 0.3 m above a spring high tide.

No postcode in WC2B stands below an ordinary spring high tide at London Bridge. The lowest, WC2B 4RD, is 0.3 m above it and 1.2 m below the tide of 1 February 1953.

Ground at eight in ten of its postcodes: between 18 m and 23 m, measured from Ordnance Datum; the middle one stands at 22 m.
One of 175 stands lower than the 1953 tide (5.41 m).
One lies in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
Mostly in Camden; partly in Westminster.

Open WC2B on the map