The main features of the oppida are the walls and gates, the spacious layout, and usually a commanding view of the surrounding area.
In Britain the oppidum of Camulodunon (modern Colchester, built between the 1st century BC and the 1st century AD), tribal capital of the Trinovantes and at times the Catuvellauni, made use of natural defences enhanced with earthworks to protect itself [REF].