The Kingdom of the East Angles, formed about the year 520 by the merging of the North and the South Folk, was one of the seven traditional kingdoms of the so-called Anglo-Saxon heptarchy.
With possible connections to Beowulf, and a distinctive geography, Anglia is often overlooked when discussing the folklore and legends of the British Isles.
M.R.James used Aldeburgh as the fictional “Seaburgh” when writing “A Warning to the Curious”.

Where is East Anglia? What does it look like?

The Legend of Beowulf, explored by Dueling Modems.

The historical Kings of Anglia

About the “Warning” locations by Darroll Pardoe