EC4V: one of 111 postcodes stands below a spring high tide

The ground at one of EC4V's 111 postcodes, EC4V 3PT, is lower than an ordinary spring high tide at London Bridge (3.9 m above Ordnance Datum).

• Ground at eight in ten of its postcodes: between 4.5 m and 14 m, measured from Ordnance Datum; the middle one stands at 10 m.
• 24 of 111 stand lower than the 1953 tide (5.41 m).
• 22 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in City of London; partly in Islington.