SM4: 9.7 m clear of the highest tide in the London Bridge ledgers

SM4 on the relief of London, with a tide staff: 9.7 m above the 1953 tide, the highest in the ledgers.

The lowest postcode in SM4, SM4 4AW, stands 9.7 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, SM4 6SJ, stands 40 m above it.

Ground at eight in ten of its postcodes: between 18 m and 39 m, measured from Ordnance Datum; the middle one stands at 26 m.
None lies in the Environment Agency's Flood Zone 3 from the sea.
Mostly in Merton; partly in Sutton.

Open SM4 on the map