Bwlch-y-Ddeufaen

Bwlch-y-Ddeufaen (Welsh for 'gap/pass of the two stones') is a mountain pass in Conwy county borough, north Wales, traversable only on foot or horseback, following the former Roman road from Caerhun (Canovium) to Caernarfon (Segontium).

On the mainland side, the route was part of the network of drovers' roads that reached all the major centres of population in Wales and England.

Cattle, sheep and even geese were regularly driven that way on foot down the ages to 1850 or even later, quite often as far as London, which was the largest market in Britain.

Several Roman milestones have been discovered on this route or in the area, including one giving the distance to Kanovium (sic).

of 1777 to reconstruct this ancient Roman road from Tal-y-Cafn via Bwlch-y-Ddeufaen over the high pass to Abergwyngregyn but they failed to carry out the work.