SE19: 43 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in SE19, SE19 3HX, stands 43 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, SE19 2QN, stands 110 m above it.
- Ground at eight in ten of its postcodes: between 67 m and 111 m, measured from Ordnance Datum; the middle one stands at 90 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- Mostly in Croydon; partly in Lambeth.