Usk Valley Walk Official Route Guide
Whilst less well known than the Wye Valley the Usk Valley matches it for beauty. From its source on Fan Foel in the Brecon Beacons National Park the river flows through Brecon along a broad valley separating the Brecon Beacons and the Black Mountains. Below Crickhowell it crosses from the county of Powys into Monmouthshire, once part of the ancient kingdom of Gwent. From Abergavenny it meanders past quiet hamlets and villages; the historic market town of Usk; the former Roman fortress of Isca, now Caerleon, entering the Severn Estuary at Newport.
The most useful maps for walkers of this route are Ordnance Survey Explorer 152 - Neport & Pontypool, 13 - Brecon Beacons National Park Eastern Area and 12 - West & Central areas.