Explore details about location Heol Cwm Mawr. Heol Cwm Mawr is a location situated within the Neath Port Talbot alongside other areas such as Central Road, Heol Glanllechau, West End. Additionally, some smaller parts of Heol Cwm Mawr include specific areas like Brynna Road, Cwmclais Road, Brynglas Avenue adding to the diversity of its landscape.