A Viereckschanze (from German "four-corner-rampart"; plural -en) is a rectangular ditched enclosure that was constructed during the Iron Age in parts of Celtic Western Europe. They are widespread in Germany and parts of northern France. and also in the iberian peninsula 
- Cunliffe, Barry (1997). The Ancient Celts. Oxford and New York: Oxford University Press; pp. 200-201.
- Koch, John T. (2006). Celtic Culture: A Historical Encyclopedia 1. ABC-CLIO. p. 229. ISBN 978-1-85109-440-0. Retrieved 7 January 2015.
Plan of the densely-occupied Bopfingen: the 2nd-century BC Viereckschanze (83 m x 73 m) is at the bottom, a 9.5 x 10 m building lies inside the Viereckschanze to the lower left, and two other buildings are visible as large post holes at opposite ...
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