The Dane’s Cast is a prehistoric earthwork the remains of which appear in County Armagh and in County Down. It may once have been a continuous line, interrupted by the Newry River, but is now visibale only in sections, the best preserved of which is found at Scarva, in Downshire, running along the Newry River.
A number of prehistoric burial mounds are found along the course of the Dane's Cast.
- The Great Wall of Ulidia; Commonly Known as "The Dane's Cast", or "Gleann na Muice Duibhe" (continued) - Ulster Journal of Archaeology, Second Series, Vol. 3, No. 2 (Jan., 1897), pp. 65-82
- The linear earthwork known as the Dane's Cast early descriptions general observations and a newly recognised extension at Newtown, Co. Armagh
- Locations in Counties Armagh and Down – Black Pig's Dyke