The route passes through the heart of Wales, and is also known as. It is largely north–south from Holyhead to Cardiff or Chepstow, and in total measures some 400 km in length. Some of its route follows the trackbed of former railway lines, such as Lôn Las Menai, Lôn Eifion, the Mawddach Trail and the Taff Trail; in other places, the route is on public highways. Both ends are easily accessible via the rail network.

Route

Cardiff to Brecon

This largely follows the Taff Trail: Cardiff | Pontypridd | Abercynon | Merthyr Tydfil | Brecon

Alternative: Chepstow to Glasbury

Lon Las Cymru provides an alternative south route for those coming into Wales from the Severn Bridge, following Route 42 from Chepstow to Glasbury, where it joins Route 8: Chepstow | Usk | Abergavenny | Glasbury There is also a small loop at the top of Route 42 providing links to Hay-on-Wye.

Brecon to Machynlleth

Brecon | Talgarth | Glasbury | Erwood | Builth Wells | Newbridge on Wye | Llanwrthwl | Rhayader | Llangurig | Llanidloes | Staylittle | Machynlleth

Machynlleth to Porthmadog

Machynlleth | Dolgellau | Trawsfynydd | Penrhyndeudraeth | Porthmadog

Porthmadog to Holyhead

Porthmadog | Penygroes | Caernarfon | Bangor | Holyhead