| http://www.w3.org/ns/prov#value | - Nearly 600 hillforts are in Wales, over 20% of those found in Britain, examples being Pen Dinas near Aberystwyth and Tre'r Ceiri on the Lleyn peninsula.[11] A particularly significant find from this period was made in 1943 at Llyn Cerrig Bach on Anglesey, when the ground was being prepared for the construction of a Royal Air Force base.
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