B4299 (Gurnos - Brynamman)

This article is about the original B4299, now part of the A4068.
For the current B4299 north of St Clears, see B4299.

The A4068 (former B4299) at Cwm-twrch Uchaf

The original route of the B4299 ran along the edge of the Black Mountain in south Wales.

It started on the B4297 (now A4067) in Gurnos, Brecknockshire, in the Swansea Valley. It then headed northwest via Cwm-twrch Isaf and Cwm-twrch Uchaf along the valley of the Twrch River. Eventually the road crossed the river - and entered Carmarthenshire - before passing through the Glamorganshire village of Cwmllynfell.

After crossing the moors to Rhosaman the road reached the valley of the Amman River. It followed this downstream (albeit not very closely) to its terminus on the B4300 (now A4069) in Brynamman.

The road was upgraded to Class I status in 1935, being renumbered A4068. It retains this number except for in Gurnos itself, which is now bypassed.