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IIRC the Norfolk Broads (an interconnected series of lakes and waterways in the same part of the country as Norwich and Ipswich) were dug by the Romans who burned peat to make salt

We get the word salary from salt too

Source "King of the North" by Max Adams:

"The Old English ending -wic ... means farm, as in Keswick (cheese farm), or Goswick (goose farm) ... but it might denote a periodic, opportunistic beach market ... for example Lundenwic (London), Gypeswic (Ipswitch) and so on."

It seems it came to be applied to farms in some areas, but it was more widely used: https://en.wikipedia.org/wiki/-wich_town

It is not even 8am, and I learned something interesting already. Thank you very much!