The Roman Map of Britain Garianno Burgh Castle or Caister-on-sea, Suffolk

Garriano (ND xxviii₇ illustration)
Praepositus equitum stablesianorum Gariannonensium vars. GariannonenŠ, Garrianonensis (ND xxviii₁₇ text)
Gariannonor var. Garianonor, Garrianonor (ND xviii₁₇ text)

Garriano has traditionally been held to be Burgh Castle (tg4704), but the equivalence is now questionable in light of the discovery of another contemporary Roman fort at Caister-on-sea (tg5112). Both forts are at the mouth of the old Yare estuary, much silted up since Roman times.

And yet perhaps another -
J.R.L. Allen, E.J. Rose and M.G. Fulford: 'Re-use of Roman Stone in the Reedham Area [TG4101] of East Norfolk: Intimations of a Possible 'Lost' Roman Fort' BRITANNIA XXXIV (2003) 129-141
http://www.romansociety.org/webbrit03.htm#bk9