E11: 1.8 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in E11, E11 4HE, stands 1.8 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, E11 1PJ, stands 30 m above it.
- Ground at eight in ten of its postcodes: between 14 m and 29 m, measured from Ordnance Datum; the middle one stands at 19 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- Mostly in Waltham Forest; partly in Redbridge.