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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 MerciaMercia
, one of the kingdoms of Anglo-Saxon England, consisting generally of the region of the Midlands. It was settled by Angles c.500, probably first along the Trent valley.
..... Click the link for more information. , 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.