River Thames Does Not Flow Through Norfolk

No. The River Thames flows across southern England—from the Cotswolds through Oxford, Reading, London, to the North Sea at the Thames Estuary (Essex/Kent).

Norfolk lies in East Anglia, drained by the River Great Ouse, Wensum, Yare, Bure—flowing into the Wash and North Sea separately. The Thames catchment ends at the London Basin; it never reaches Norfolk.