River Usk River Usk The River Usk (; ) rises on the northern slopes of the Black Mountain ("y Mynydd Du"), Wales, in the westernmost part of the Brecon Beacons National Park. Initially forming the boundary between Carmarthenshire and Powys, it flows north into Usk Reservoir, then east by Sennybridge to Brecon before turning southeast to flow by Talybont-on-Usk, Crickhowell and Abergavenny after which it takes a more southerly course. Beyond the eponymous town of Usk it passes the Roman legionary fortress of Caerleon to flow through the heart of the city of Newport and into the Severn estuary at Uskmouth beyond
Newport Creek closer to the strip mines at this point. It continues east, out of Newport Township and into the community of Nanticoke, where the tributary South Branch Newport Creek flows into Newport Creek. Newport Creek then flows through Nanticoke, passing a mountain known as Honey Pot. At this point, the creek turns north and reaches its confluence with the Susquehanna River. There are several major tributaries of Newport Creek, including South Branch Newport Creek. South Branch Newport Creek's headwaters are in an area of wetland between Penobscot Mountain and Little Wilkes-Barre Mountain. Other tributaries include UNT 28347, UNT 64681, UNT 28345,