Road station
Ad Drinum
Zvornik?
Ad Drinum, at the Drina, was a road junction on the way from Sirmium south to the silver mines of Argentaria, where the road crossed the river Drina, probably near Zvornik on the border of Bosnia and Serbia, or a little north of it. Yet the map draws no Drina here: it lets that river run off into the Adriatic instead. The figure for the next stage, to Argentaria, is missing, and older research thought whole stations had dropped out.