SE25: 31 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in SE25, SE25 4FR, stands 31 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, SE25 6BQ, stands 108 m above it.
- Ground at eight in ten of its postcodes: between 43 m and 78 m, measured from Ordnance Datum; the middle one stands at 52 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- In Croydon.