SE6: 8.9 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in SE6, SE6 4FA, stands 8.9 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, SE6 4XN, stands 44 m above it.
- Ground at eight in ten of its postcodes: between 17 m and 39 m, measured from Ordnance Datum; the middle one stands at 24 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- In Lewisham.