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Monmouthshire, Brecon & Abergavenny Canals

The Brecon & Abergavenny Canal runs from Brecon to Pontymoile Junction where it joins the Monmouthshire Canal, which then ran to Newport with an arm to Crumlin.

Things to do nearby

Herefordshire and Gloucestershire (1)
Herefordshire and Gloucestershire 3
Herefordshire and Gloucestershire (2)

Facts & Stats

33.3 miles


The length of the Brecon & Abergavenny Canal that is navigable.

2.2 miles


The length of the Monmouthshire Canal that is navigable.

6 locks

Brecon & Abergavenny Canal

From Brecon to Newport

The Monmouthshire Canal is mostly under restoration, with only the 2.2 miles (3.5 km) from Pontymoile Junction to Cwmbran Tunnel fully navigable. The canals are isolated from the main connected network of waterways in England and Wales.

The Monmouthshire Canal and the Brecon and Abergavenny Canal were proposed at the same time and joined at Pontymoile, although they were operated separately until the companies merged in 1865. They were built to transport coal, lime, iron, iron ore and agricultural products.

Maximum boat sizes

  • Length: 60′ 0″ (18.29 metres) – Llangynidr Locks
  • Beam: 9′ 2″ (2.8 metres) – Llangynidr Locks
  • Height: 5′ 6″ (1.67 metres) – Ashford Tunnel
  • Draught: 4′ 7″ (1.4 metres) – cill of Langynidr Locks – but silting means the canal is much shallower than this in many places.

Navigation authority

Canal & River Trust

Local Events

Aberdulais Aqueduct

Aberdulais Aqueduct is a Grade II* listed building and Scheduled Ancient Monument at risk from the effects of climate change.

Waterways in Progress Grant: Swansea Canal

IWA awarded £18,000 to the Swansea Canal Society’s Coed Gwilym Park Slipway Project as part of IWA’s Waterways in Progress Grants in 2019.