The Atlas of Hillforts of Britain and Ireland was an online database of hillforts―fortified settlements built in the Bronze Age and Iron Age―in the British Isles.
[1][2] On its launch in 2017 the atlas had 4,147 entries, which the researchers believe to be all of the extant hillforts in Britain and Ireland.
[4] Around 100 volunteers, described as "citizen scientists", also visited sites and contributed information and photographs to the atlas.
[4] The online atlas was hosted by the Arts and Humanities Research Council, which funded the project,[8] and makes use of Esri's ArcGIS web map application platform.
[9] The project also collaborated with Wikimedia UK to make the information in the atlas available to Wikipedia.