Portsmouth and its surrounding areas can be matched to Teesside
Portsmouth = Middlesbrough
Havant = Redcar
Gosport = Stockton
Fareham = Billingham
Waterlooville and surroundings = Eston/Grangetwown / South Bank
Porchester = Thornaby
Petersfield and surrounding areas = East Cleveland
Southampton has an equal pull on Gosport and Fareham equivalent to Sunderland on Billingham and Stockton - not at all really, all joking aside.
The big difference is Portsmouth is bigger because of the two league titles in the 50's it won , it's reach into Hampshire, Salisbury is more extensive, it's bit like Sunderland's into Co Durham.
When they were doing **** in the old 3rd and 4th they were getting 10000 -15000 regular home gates even when they were crap.
I think on some fronts our fans are very similar, no one likes us and everyone dismisses our support.