Three Roman forts associated with the Saxon Shore defences are located in Norfolk (and one of them used to be located in Suffolk before the county boundary changed!). David Gurney has written a helpful illustrated booklet on the forts for the Norfolk Archaeological Trust: Outposts of the Roman Empire: a guide to Norfolk’s Roman forts at Burgh Castle, Caister-on-Sea and Brancaster (2002). There is an introductory section that includes a map of Roman Norfolk, and another showing the estuary of the Bure, Yare and Waveney in the Roman period.
The book contains information about how to visit the three sites, and where to see the finds. There is also a short bibliography.