Hillforts, dating from c1000BC to 400AD, are located across Scotland on low hills, promontories and cliffs. Bounded by ditches and earthen ramparts or stone walls, the inner area may have been a place of permanent or seasonal occupation. The remains of round houses may be seen within some some hillforts, while others bear evidence of several different periods of construction. Some later prehistoric fortified sites are quite small (less than a hectare) and are therefore not recorded as HLA data.
The fortified site of White Caterthun, Angus, extends to the outer perimeter visible in the surrounding heather moor. Current and historical OS maps note hillforts, and aerial photography may reveal the full extent of their bounds.