Offa's Dyke, ancient entrenchment of W England and E Wales, from the Dee estuary to near the estuary of the Wye River. It was built in the 8th cent. by Offa, king of Mercia, as a barrier against the Welsh and lies mainly along the England-Wales boundary. Watt's Dyke, a similar work, roughly parallels a section of Offa's at a distance of c.2 mi (3.2 km). Parts of the dikes are well preserved.
"Offa's Dyke." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (December 13, 2018). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/offas-dyke
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