near a ford and junction of two Roman roads running through the area. One was a minor route of Sarn Helen that linked Deva Victrix (Chester) and a fort at Brithdir, Caerphilly. The other road connected the outpost with the Roman fort of Tomen y Mur, through Pennant-Lliw. The fort lay on a low shoulder with steep slopes on three sides. To the north, is Arenig Fawr () with the Berwyn Mountains and Aran Benllyn to the south.