SM2: 48 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in SM2, SM2 6HZ, stands 48 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, SM2 5LW, stands 111 m above it.
- Ground at eight in ten of its postcodes: between 62 m and 94 m, measured from Ordnance Datum; the middle one stands at 74 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- In Sutton.