SE2: 256 of 463 postcodes stand below a spring high tide

The ground at 256 of SE2's 463 postcodes (55%) 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 0.7 m and 63 m, measured from Ordnance Datum; the middle one stands at 2.0 m.
• 262 of 463 stand lower than the 1953 tide (5.41 m).
• 261 lie in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
• Mostly in Greenwich; partly in Bexley.