positions of road, tramroad and works are more accurately
shown on the map to the right which is based on Prujean's
map of 1843 entitled "Map of the Iron Works and Collieries
and their Means of Communication by Railroad, Tramroad and
Canal with the Ports of Newport and Cardiff".
is indicated in red and the roads black. Both the Ponthir
Works and Caerleon Works made use of water power from the
River Afon Lwyd which runs down to join the River Usk at
the foot of the map.