It's not a port mainly because it's not on a coastal join of river and sea. That's not a waste - that's a geographical feature. Only Dover and Folkestone buck that status, and that's because of their proximity to France. Excavating a new port entrance in the city when there's one seven miles to...
Within the city boundaries, there are eight.
Brighton
Hove
Aldrington
Portslade
Preston Park
London Road
Moulsecoomb
Falmer
The city boundary starts at the eastern end Fishersgate station platform.
In terms of metropolitan areas, we're listed as the Brighton-Worthing-Littlehampton conurbation - and the 12th largest.
The coastal strip of the city (as in the administrative city) is 8 miles, from Portslade to Saltdean.
If you want the furthest extremeties - Mile Oak to 'north' Saltdean is...