Embankment & Aqueduct of Brecknock & Abergavenny Canal inc. N Revetment Walls and SW Overflow Bridge

Massive wooded earth embankment standing approximately 25 metres high and some 100 metres long, blocking the lower mouth of the Clydach Gorge, the Clydach River taken through a long segmentally-arched tunnel. Tunnel is approximately 90 metres long. Arched buttressed portals with ashlar voussoirs and rubble abutments. Above, to north is former tramroad tunnel, now used as pedestrian route. Round-arched tunnel with stone voussoirs to portals; segmental over-arch to W side. Very long rubble revetment wall to NW containing earth bank, following line of track to Waterfall Cottages. To NE of tramroad tunnel are sloping splayed revetments. To SW is very small segmentally-arched bridge over overflow with stone voussoirs and rubble-capped parapet.