N15: 2.2 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in N15, N15 4RB, stands 2.2 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, N15 3XP, stands 35 m above it.
- Ground at eight in ten of its postcodes: between 9.4 m and 21 m, measured from Ordnance Datum; the middle one stands at 14 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- Mostly in Haringey; partly in Islington.