EC1R: 5.6 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in EC1R, EC1R 3DJ, stands 5.6 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, EC1R 1XY, stands 31 m above it.
- Ground at eight in ten of its postcodes: between 14 m and 30 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 Islington; partly in Camden.