There are three possible Pwll Heligs in Wales, all of which are in the wrong location if Cynllibiwg was North of the Wye: Pwll-Helyg in Cardiff is/was approximately the right size (see Visit Details). It possibly remains as a dried hollow under the M4 motorway. Pwll-Helyg/Helig near Ynysybwl is better known. While maps back to 1884 don't appear to show a pool at this location, suggesting the name might refer to a deep area of the nearby river, they do show a well close by on the opposite bank. Pwll-Helyg/Helig/Elech near Llantwit Major appears to have been destroyed by a railway cutting and bridge, though the location can be seen on the 1885 map. It seems too large and irregular to be our location. Additionally there are two that are much less likely: Pwll-Helig near Aberdovey is too far off track (though it is not marked on maps as such, see, for example, this Address). Secondly, there is a strong folklore that Pwllheli was set up by a man called Helig, and the name has become shortened, however, it seems more likely that this name relates to Heli (modern Welsh for "Brine"). Of course, it is quite possible both that similar sites have disappeared or that the sites above have relatively recent names.